Why the Bolsheviks Were Able to Seize Power in 1917

The Military Revolutionary Committee was the organisational instrument of the October Revolution. First, it was established between 12 and 16 October 1917 (Old Style) by the Petrograd Soviet under Trotsky's chairmanship — formally created to defend Petrograd against the German military threat (Kerensky was suspected of wanting to surrender the capital to forestall Bolshevik revolution) but actually the command organ of the Bolshevik insurrection. Second, the nominal chair was Pavel Lazimir (a Left SR providing non-Bolshevik camouflage); Trotsky directed most meetings as the real leader; members were ~80% Bolshevik in practice, with some Left SRs. Third, the MRC's functions: commanding the Petrograd garrison (~200,000 soldiers, neutral or pro-Bolshevik); coordinating with Red Guards (~25,000-40,000 armed workers); liaising with Baltic Fleet sailors (especially at Kronstadt and on warships including the Aurora); planning specific operations for the seizure of key buildings; issuing orders to military and civilian units. Fourth, the MRC executed the October seizure of power on 24-25 October 1917: directing Red Guards to seize the telegraph, banks, railway stations, bridges; coordinating with naval forces; signalling the assault on the Winter Palace with the Aurora's blank shell at 9:40 p.m. on 25 October; arranging the arrest of the Provisional Government's ministers at ~2 a.m. on 26 October. Total Petrograd casualties: ~30-50 — remarkably bloodless because the MRC's planning was excellent and the Provisional Government had no troops to defend it.

The Sovnarkom was the first Bolshevik government of Soviet Russia. First, the Council of People's Commissars (Sovet Narodnykh Komissarov — Sovnarkom) was established by the Second All-Russian Congress of Soviets on 26 October 1917 as the new Russian government replacing the Provisional Government. Second, the term 'People's Commissar' (narodny komissar) was deliberately chosen over the bourgeois title 'Minister' to mark the revolutionary character of the new government — a terminology innovation suggested by Trotsky. Third, the first Sovnarkom was entirely Bolshevik (Left SRs joined later in December 1917): Vladimir Lenin Chairman (Prime Minister); Leon Trotsky Commissar for Foreign Affairs (later People's Commissar for War from March 1918); Joseph Stalin Commissar for Nationalities; Alexei Rykov Commissar for Internal Affairs; Anatoly Lunacharsky Commissar for Public Enlightenment (Education); Vladimir Antonov-Ovseyenko and others as military commissars. Fourth, Sovnarkom immediately began legislating through decree: the Decree on Peace (26 October — immediate armistice, no annexations, published secret Allied treaties); the Decree on Land (26 October — abolished private ownership, legitimised peasant seizures, based on SR programme); subsequent decrees on workers' control (14 November), nationalisation of banks (14 December), nationalisation of industry (April 1918), and many others. The Sovnarkom ruled by decree without legislative oversight (the Constituent Assembly was dispersed in January 1918); it became the executive of the Soviet state and remained the formal government until reorganised in 1923-24.

The Second All-Russian Congress of Soviets, meeting from 25 to 27 October 1917, was the political body that legitimised the Bolshevik seizure of power, passed the first Bolshevik decrees, and established the Sovnarkom. Its sessions transformed an armed coup into a Soviet political order — at least in the new regime's self-presentation. The setting (10:40 p.m. 25 October 1917). The Congress opened at 10:40 p.m. on 25 October 1917 (Old Style; 7 November New Style) at the Smolny Institute in Petrograd — Bolshevik headquarters. The timing was deliberate: Trotsky had planned the Bolshevik insurrection to coincide with the Congress so that the seizure of power could be legitimised by the Soviet body. As the Congress opened, the Bolshevik forces were still completing the seizure of the Winter Palace; the Provisional Government's ministers would not be arrested for another 3-4 hours. Composition of the delegates. The Congress had approximately 650 delegates from soviets across Russia. The distribution was: Bolsheviks ~390 (~60%), Left SRs ~80 (~12%), Mensheviks ~80 (~12%), Right SRs ~60 (~9%), and others ~40. The Bolsheviks together with their Left SR allies controlled approximately 72% of the Congress — a clear majority. The Bolsheviks had achieved this majority through their takeover of city soviets after the Kornilov Affair (Petrograd 9 September, Moscow shortly after, most major city soviets by October). The opening. Lev Kamenev (the same Kamenev who had opposed Lenin's insurrection on 10 October) chaired the opening session — testimony to the Bolsheviks' need for senior leadership in public despite internal disagreement. The atmosphere was tense: armed Red Guards were visible at the doors; the sound of the Aurora's blank shell signal had been heard hours earlier; news of the seizure of various government buildings was arriving. The Menshevik-Right SR walkout. The Mensheviks and Right SRs were horrified at the unfolding coup. Their leaders — including Yuli Martov (Menshevik) and various SR representatives — denounced the Bolshevik takeover as a military conspiracy that would split the revolution and potentially provoke civil war and German victory. Martov proposed a compromise: a coalition government of all socialist parties (Bolsheviks, Mensheviks, SRs together). The Bolsheviks rejected the proposal. Trotsky's response was the most famous moment of the Congress. Faced with the Menshevik-Right SR opposition, Trotsky delivered his celebrated dismissal: 'You are pitiful isolated individuals; you are bankrupts; your role is played out. Go where you belong from now on — into the dustbin of history!' The phrase 'dustbin of history' entered political vocabulary. The Mensheviks and Right SRs walked out of the Congress in protest. This was a catastrophic political miscalculation: by walking out, they left the Bolsheviks and Left SRs in unchallenged majority; they gave the Bolshevik takeover the appearance of Soviet legitimacy by default; they removed moderate socialist voices from the new political settlement; they split the socialist movement permanently. Martov realised the mistake almost immediately and tried to return, but the moment had passed. News of the Winter Palace. At approximately 2 a.m. on 26 October, news reached Smolny that Bolshevik commander Vladimir Antonov-Ovseyenko had arrested the Provisional Government's cabinet in the Malachite Hall of the Winter Palace. The seizure of power was complete. Lenin appears (evening of 26 October). Vladimir Lenin had been in hiding since July; he had been at Smolny directing the insurrection from a back room. On the evening of 26 October 1917, with the seizure complete and the Congress confirming Bolshevik authority, Lenin appeared in public for the first time since July. He was greeted with a standing ovation by the delegates. His famous understatement to the Congress: 'We shall now proceed to construct the socialist order.' The Decree on Peace. On 26 October 1917, the Congress passed Lenin's Decree on Peace with overwhelming Bolshevik-Left SR support. Key provisions: immediate end to the war without annexations or indemnities; proposed three-month armistice while peace negotiations began; appealed to all belligerent peoples to end the war; published the secret Allied treaties (including the Sykes-Picot Agreement and Russia's promised Constantinople and the Straits) to expose imperialist war aims. The decree was as much propaganda as policy — the Bolsheviks could not unilaterally end the war but could announce intent and undermine Allied legitimacy. Real peace would come through the brutal Treaty of Brest-Litovsk in March 1918 (Topic 12.3). The Decree on Land. Also on 26 October 1917, the Congress passed the Decree on Land — Lenin's most politically brilliant act. Key provisions: abolition of private ownership of land; confiscation of all landed estates, monastery and church land without compensation; distribution of land to peasants through local soviets; recognition of the peasant land seizures that had already occurred during 1917. The decree was based on the SR programme (peasant ownership) rather than Bolshevik orthodoxy (state nationalisation) — Lenin recognised that the SR programme matched what peasants actually wanted. By adopting it, Lenin stole the SR's central appeal and won peasant support for the Bolsheviks. Crucially, the decree legitimised what was already happening — peasants had been seizing land since spring 1917. The Bolsheviks did not give peasants land; they accepted peasant action and called it official policy. The Sovnarkom. On 27 October 1917, the Congress established the Sovnarkom (Council of People's Commissars) as the new government — entirely Bolshevik (Left SRs would join in December). Key appointments: Lenin Chairman; Trotsky Foreign Affairs (later War); Stalin Nationalities; Rykov Interior; Lunacharsky Education; Antonov-Ovseyenko and others military commissars. The term 'People's Commissar' was chosen to distinguish the new government from bourgeois 'Ministers'. The Soviet Central Executive Committee (TsIK). The Congress also elected an All-Russian Central Executive Committee (TsIK) as the standing organ between Congresses: 101 members, with Bolshevik-Left SR majority. Kamenev was elected chairman initially, then replaced by Yakov Sverdlov in November 1917. The political significance. The Second Congress of Soviets transformed the Bolshevik armed coup into a Soviet political order — at least formally. The Bolsheviks could now claim: the Provisional Government has been overthrown by the Soviets; the new government is the Council of People's Commissars; policy is being made by Soviet decrees (Peace, Land); the new authority rests on Soviet legitimacy. This legitimacy claim was crucial for the next four years of Civil War — the Bolsheviks could present themselves as the defenders of Soviet power against White counter-revolutionaries who wanted to restore the autocracy. The Mensheviks and Right SRs after the walkout. The Mensheviks and Right SRs who had walked out tried to organise opposition through a 'Committee for Salvation of the Country and the Revolution' — but they had limited support, having forfeited their position at the Congress. They would be marginalised through 1917-18 and eventually banned by the Bolsheviks in 1921-23. The walkout was a decisive political mistake for which they paid for the rest of the Soviet era. The wider point. The Second Congress of Soviets shows the political-legal construction of the Bolshevik regime. The seizure of power was an armed coup; the Congress made it a Soviet government. The decrees on Peace and Land delivered immediate popular policy; the Sovnarkom provided governmental form. Within hours of taking power, the Bolsheviks had built a legitimating political structure that would sustain them through war, revolution, civil war, and the construction of the world's first communist state. Conclusion. The Second All-Russian Congress of Soviets, 25-27 October 1917, was the political moment of the October Revolution. It legitimised the Bolshevik seizure of power; passed the foundational Decrees on Peace and Land; established the Sovnarkom; saw the Menshevik-Right SR walkout that handed the Bolsheviks Soviet legitimacy; and witnessed Lenin's first public appearance as head of the new Russian government. Within three days, an armed coup had become a political-legal Soviet regime. The Russian Empire of October 1917 had become the Russian Soviet Republic of late October 1917, ruled by the Council of People's Commissars chaired by Vladimir Lenin. The 20th century's first communist government had begun.

Trotsky was important to the October Revolution for three connected reasons. First, Trotsky provided the practical organisation that turned Lenin's strategic vision into actual seizure of power. While Lenin developed the political strategy (April Theses, persistent demands for insurrection, the 10 October Central Committee decision), Trotsky provided the practical organisational genius that executed it. Their roles were complementary: Lenin's strategic vision plus Trotsky's organisation equalled the October Revolution. Lenin without Trotsky lacked operational capacity; Trotsky without Lenin lacked strategic clarity (he had only been a Bolshevik since July 1917). Second, Trotsky's chairmanship of the Petrograd Soviet from 25 September 1917 gave the Bolsheviks an institutional platform. After the Bolsheviks won majority in the Petrograd Soviet on 9 September 1917 (following the Kornilov Affair), Trotsky was elected chairman on 25 September. This gave him: a legitimate public platform for revolutionary speeches; operational control over Soviet affairs in the capital; the institutional legitimacy to establish the Military Revolutionary Committee; and public visibility when Lenin was in hiding. Trotsky used this position brilliantly, becoming the public face of the Bolshevik insurrection while Lenin remained in disguise. Third, Trotsky established and ran the Military Revolutionary Committee (MRC), which actually executed the seizure of power. Between 12 and 16 October 1917, Trotsky established the MRC within the Petrograd Soviet — nominally to defend the capital against German attack, actually the command organ of the Bolshevik insurrection. The MRC was a brilliant tactical innovation: by disguising the insurrection as Soviet defence, Trotsky gave the operation political cover and institutional legitimacy that an open Bolshevik coup would have lacked. He coordinated Red Guards (~25,000-40,000 armed workers), the Petrograd garrison (~200,000 soldiers), and Baltic Fleet sailors (Aurora and other vessels). On 21 October he secured the garrison congress's vote to recognise only MRC authority. He timed the insurrection for 24-25 October to coincide with the Second All-Russian Congress of Soviets, providing the political legitimacy claim. He directed specific operations on the night of 24-25 October — the seizures of telegraph offices, banks, railway stations, bridges; the storming of the Winter Palace; the Aurora's signal shell. Together — practical organisation, Petrograd Soviet chairmanship providing platform, and MRC executing the seizure — these reasons made Trotsky indispensable to October 1917. Without him, Lenin's strategy might have produced a different outcome — perhaps a delayed, less successful, or differently-organised seizure. Trotsky's brilliant tactical execution turned a Bolshevik political decision into a successful armed coup with only ~30-50 Petrograd casualties. The October Revolution was, more than any other twentieth-century revolution, the product of specific individual leadership: Lenin's strategic vision and Trotsky's practical organisation in combination.

Popular support was important but limited and ambiguous in the Bolshevik success of October 1917. The Bolsheviks had genuine support from urban workers, soldiers and sailors, and they had won majorities in the major city Soviets — but they lost the November 1917 Constituent Assembly elections (SRs ~38%, Bolsheviks ~24%), and rural Russia did not support them. The October seizure of power was a coup with popular acceptance rather than a mass revolution. The fairest verdict is that popular support among urban workers and soldiers was real and important, but the seizure of power was primarily an organised Bolshevik party action that exploited acceptance rather than demanding direct popular mobilisation. The case that popular support was crucial. First, the Bolsheviks had genuine working-class support by October 1917. Party membership had grown from ~24,000 (February) to ~350,000 (October) — a fifteen-fold increase reflecting genuine appeal. The growth came from workers in industrial Petrograd, Moscow, Donbas, Baku, and other industrial centres. Workers organised through factory committees were largely Bolshevik or Bolshevik-aligned. The slogans 'Peace, Land, Bread' and 'All Power to the Soviets' had genuine working-class resonance. Second, the Petrograd and Moscow Soviets had Bolshevik majorities. The Bolsheviks won the Petrograd Soviet on 9 September 1917 with Trotsky as chairman from 25 September; the Moscow Soviet shortly after; most major city Soviets by October. The Soviet base of legitimacy was Bolshevik. 'All Power to the Soviets' was a coherent Bolshevik political claim because the Bolsheviks ran the Soviets. Third, the Petrograd garrison was neutral or sympathetic. The ~200,000 soldiers of the Petrograd garrison had been politicised by months of revolutionary atmosphere; on 21 October 1917 the garrison congress voted to recognise only MRC authority — effectively transferring military loyalty from the Provisional Government to the Bolshevik-led Soviet. Without garrison support (or at least neutrality), the seizure would have been crushed. Fourth, the Baltic Fleet sailors were strongly Bolshevik or anarchist. Kronstadt sailors were particularly militant; the Aurora's crew fired the signal shell; sailors of the Samson, Amur and other warships participated in the seizure. The fleet's revolutionary radicalism provided crucial military force. Fifth, the Decree on Land (26 October 1917) delivered what the rural population wanted — by legitimising peasant land seizures already in progress. After the decree, peasants accepted Bolshevik authority in principle as the regime that had given them land. This rural acceptance (passive support) was important for the Bolshevik consolidation in the months that followed. Sixth, the Bolshevik clear slogans addressed mass grievances. 'Peace' for war-weary soldiers; 'Land' for peasants; 'Bread' for hungry urban populations; 'All Power to the Soviets' for those rejecting the Provisional Government. The simple-immediate-concrete-inclusive nature of these slogans gave the Bolsheviks mass appeal across multiple constituencies. The case that popular support was limited. First, the Bolsheviks lost the November 1917 Constituent Assembly elections. Elections were held on 12 November 1917 — three weeks after the seizure. Results: SRs ~21 million votes (~38%), Bolsheviks ~10 million votes (~24%), Kadets ~2 million, Mensheviks ~1.4 million, others ~10 million. The SRs (especially Right SRs) won the largest bloc; the Bolsheviks won Petrograd, Moscow, the army, but lost rural Russia where peasants voted SR. The Bolsheviks did not have majority popular support across Russia. Second, the Bolsheviks dispersed the Constituent Assembly after one day (5-6 January 1918) because they would have lost a fair vote. The Assembly met on 5 January 1918; the Bolsheviks dispersed it the next morning with the famous declaration that 'the guard is tired'. The dispersal showed that the Bolsheviks were not willing to accept majority popular will — they had taken power and would keep it through force, not popular vote. Third, the October seizure was a coup, not a mass revolution. Total Petrograd casualties were ~30-50; most of the city's population continued its normal routine — cafes operated, theatres performed, ordinary residents walked past indifferently. The actual seizure of power involved only a few thousand Red Guards, sailors and Bolshevik soldiers. This was not a mass uprising; it was an organised takeover by a politically committed minority with mass acceptance afterwards. Fourth, rural Russia did not actively support the Bolsheviks. The peasants accepted the Decree on Land but voted SR in the Constituent Assembly. The Bolsheviks' urban base would face years of conflict with the rural population — culminating in the Civil War (1918-21) and especially the War Communism period with its grain requisitioning that produced peasant uprisings (Kronstadt 1921 — even Kronstadt sailors turned against the Bolsheviks). Fifth, the Mensheviks and Right SRs walked out of the Second Congress of Soviets, leaving the Bolsheviks with majority by default. The walkout reflected genuine socialist opposition to the Bolshevik coup. If the Mensheviks and SRs had stayed, the Bolsheviks would have lacked the Soviet majority they exploited. Bolshevik 'Soviet legitimacy' depended on opponents' miscalculation. Sixth, the Bolshevik success depended more on organisation than popularity. Lenin's leadership, Trotsky's MRC, the Red Guards (~25,000), the timing with the Congress — these were the operational factors that produced success. Popular support was a context, not a cause: without popular support the Bolsheviks could not have built their party or won the Soviets; with popular support of the SR pattern (peasant electoral majority), the Bolsheviks would have lost democratically. The Bolsheviks needed enough popular acceptance to make the seizure stick but not enough popular support to win an election. Seventh, the Bolsheviks would face civil war (1918-21) because their popular base was not broad enough to govern Russia without violent suppression of opposition — including socialist (Menshevik, SR) opposition and worker opposition (Kronstadt 1921). Weighing and comparing. Popular support was important but limited. The Bolsheviks had genuine support from urban workers, soldiers, sailors, and Soviet majorities — enough to organise and execute a coup, enough to claim Soviet legitimacy, enough to gain peasant acceptance through the Decree on Land. But this was not majority support: they lost the Constituent Assembly elections; rural Russia voted SR; they would face civil war from those who rejected their rule. The October Revolution was therefore a coup by a politically committed minority with sufficient mass acceptance to make it stick, not a mass revolution comparable to the February Revolution. The proper framework is organised seizure with limited popular acceptance: the Bolsheviks did not lack popular support, but they had specific support (urban workers, soldiers, sailors) rather than majority support (which would have included peasants). Their seizure of power exploited the specific support they had, while bypassing the majority support they lacked. Overall judgement. Popular support was important to the Bolshevik success — without it the party could not have grown to ~350,000 members; without it the Soviet majorities would have been impossible; without it the Red Guards could not have been mobilised; without it the garrison and fleet would not have been neutral or supportive. In this sense the statement (implicit in the question) that popular support mattered has real force. But it was not majority popular support. The Bolsheviks lost the Constituent Assembly elections; rural Russia voted SR; the seizure of power was a coup with mass acceptance, not a mass revolution. The fairest verdict is that popular support was crucial in giving the Bolsheviks their specific organisational capacity, but the seizure of power was primarily an organised Bolshevik party action that exploited acceptance rather than direct mass mobilisation. The Bolsheviks needed sufficient popular acceptance to make their coup stick; they did not need majority popular support, and indeed they would dispense with majority popular will when it disagreed with them (dispersing the Constituent Assembly after one day). The October Revolution showed what is possible when an organised minority has sufficient popular acceptance plus determined leadership plus brilliant tactical execution. It was a Bolshevik triumph more than a mass revolution. The combination of specific popular support (urban workers + soldiers + sailors) + Lenin's strategy + Trotsky's organisation produced the seizure of power; mass majority support was not necessary because the Bolsheviks did not seek to rule through democratic mandate but through Soviet authority backed by force. Within months the dispersal of the Constituent Assembly would make this clear.

The Bolsheviks' rise from minor underground party in February 1917 to government of Russia in October was one of the most rapid political transformations of the twentieth century. In just eight months, the party grew from ~24,000 members to ~350,000; from advising against demonstrations on Women's Day to seizing the Winter Palace; from a tiny minority in the Petrograd Soviet to its majority. The transformation depended on Lenin's strategic vision, Trotsky's organisational genius, the Provisional Government's failures, and the cumulative leftward shift of urban Russia. February 1917: marginal. When the February Revolution began on 23 February 1917, the Bolsheviks played almost no role. Their leaders were scattered abroad: Lenin in Switzerland, Trotsky in New York, Stalin in Siberian exile, Kamenev in Siberian exile, Bukharin in New York, Zinoviev in Switzerland with Lenin. The Bolshevik organisation in Petrograd was a small underground group (~24,000 members across Russia), heavily penetrated by Okhrana informers. Alexander Shlyapnikov was the senior Bolshevik organiser in Petrograd. The Petrograd Bolsheviks had advised against major demonstrations on International Women's Day (23 February), believing the moment was premature; women textile workers ignored them. The Bolsheviks were a minor force in the February Revolution. March 1917: moderate stance. Through March, the Bolshevik organisation in Petrograd took a moderate stance. Stalin and Kamenev returned from Siberian exile in mid-March; they took the moderate line — conditional support for the Provisional Government, support for the war effort, working within the Soviet's Menshevik-led consensus. Pravda (the Bolshevik newspaper, restored after February's civil liberties) was edited by Stalin and Kamenev with this moderate position. The Bolsheviks looked like just another moderate socialist party — not the radical revolutionaries they would become. Lenin's return (3 April 1917). Everything changed with Lenin's arrival at the Finland Station on 3 April 1917 via the German 'sealed train'. He immediately denounced the Provisional Government and the war. The next day (4 April) he delivered his April Theses demanding: no support for the Provisional Government; all power to the Soviets; immediate end to the war; confiscation of landed estates; nationalisation of land and banks; workers' control of production; a new Communist International. The April Theses shocked even most Bolsheviks: Kamenev wrote a Pravda editorial against them as 'unacceptable'; Stalin had been taking the moderate line; Plekhanov (father of Russian Marxism) called them 'delirious'; Mensheviks denounced as 'utopian'. April-May 1917: winning the party. Lenin spent April and early May campaigning within the Bolshevik party to win them to his radical position. He visited factory committees, Soviet meetings, party cells; argued tirelessly; eventually by late April the All-Russian Bolshevik Conference accepted his theses as party policy. The Bolsheviks were now a radical anti-government party — the only major party rejecting the Provisional Government entirely. April-July 1917: party growth. Through April-July, Bolshevik membership grew explosively: ~24,000 (February) → ~80,000 (April) → ~240,000 (July). The growth came from workers and soldiers disillusioned with the Provisional Government's continuation of the war, failure to address land, and worsening food crisis. Lenin's slogans — 'Peace, Land, Bread' and 'All Power to the Soviets' — were simple, clear, and addressed exactly what the population wanted. April Crisis (18-21 April): Milyukov's note demanding war annexations caused mass demonstrations; Milyukov and Guchkov resigned; first coalition government with 6 socialist ministers formed 5 May — Lenin denounced this as 'class betrayal' by Mensheviks and SRs. The Bolsheviks now stood alone as the only major party rejecting the Provisional Government. The June Offensive failure (~400,000 casualties) discredited the war; the army began disintegrating. July Days (3-7 July 1917): the Bolshevik nadir. The Bolsheviks suffered their worst setback in the July Days — a chaotic semi-uprising in Petrograd by ~500,000 armed workers, soldiers and Kronstadt sailors demanding Soviet power. Lenin thought the moment premature but the Bolshevik Central Committee decided to lead the demonstrations from the Kshesinskaya Mansion. The Provisional Government counter-attacked: released documents claiming Lenin was a German agent; loyal Cossacks cleared streets; Bolshevik newspapers shut; Trotsky and Kamenev arrested; Lenin fled to Finland disguised as a railway worker. The Bolsheviks looked finished. July-August 1917: regrouping. Through July-August, the Bolsheviks regrouped underground. Lenin in Finland wrote 'State and Revolution' (his theoretical work on the future Bolshevik state) and sent urgent letters demanding insurrection. Trotsky (released in July; joined the Bolsheviks formally) emerged as a major leader. The Provisional Government appeared strong but rested on shaky foundations. Kornilov Affair (25-31 August): the resurrection. The Kornilov Affair transformed Bolshevik fortunes. When General Kornilov marched on Petrograd in disputed circumstances, Kerensky armed the Bolsheviks to defend the city — released Trotsky and others, armed Red Guards (~25,000 armed workers), allowed Bolshevik propaganda to reach Kornilov's troops. Railway workers stopped Kornilov's trains; the coup collapsed. The Bolsheviks emerged as heroes of the revolution's defence. The 'German agent' rumour was forgotten. Bolshevik party membership surged: ~240,000 (July) → ~350,000 (October). September 1917: winning the Soviets. After the Kornilov Affair, the Bolsheviks won majorities in the major Soviets: Petrograd Soviet on 9 September 1917 (Trotsky chair on 25 September); Moscow Soviet shortly after; most major city Soviets by October. The institutional base of legitimacy now belonged to the Bolsheviks. October 1917: the seizure. Lenin returned secretly from Finland in early October (probably 7-9 October OS). On 10 October 1917 the Bolshevik Central Committee voted 10-2 for armed insurrection — Kamenev and Zinoviev against. Trotsky established the Military Revolutionary Committee (MRC) on 12-16 October — nominally for Soviet defence, actually for the insurrection. On 24-25 October, the MRC executed the seizure: Red Guards, soldiers and sailors took the telegraph, banks, railway stations, bridges; the Winter Palace fell at ~2 a.m. on 26 October; the Provisional Government's ministers were arrested. The Second All-Russian Congress of Soviets on 25-27 October passed the Decree on Peace and Decree on Land and established the Sovnarkom (all-Bolshevik Council of People's Commissars) with Lenin as Chairman. Why the Bolsheviks rose. The Bolshevik rise depended on: Lenin's leadership (April Theses, persistent campaign, 10 October decision); Trotsky's organisation (MRC, Petrograd Soviet chairmanship); clear slogans (Peace, Land, Bread; All Power to the Soviets); the Provisional Government's failures (war, land, food); the Kornilov Affair (armed the Bolsheviks, won the Soviets); mass party growth (~24,000 → ~350,000); Red Guards (~25,000 armed workers); neutral garrison; Baltic Fleet sailors. All these factors operated together. Remove any one and the rise becomes harder; remove Lenin or Trotsky and it becomes impossible. Conclusion. The Bolsheviks rose from minor party in February to government of Russia in October 1917 through an extraordinary combination of leadership, organisation, ideology, and opportunity. Lenin's strategic vision turned the Bolsheviks into a radical anti-government party; Trotsky's organisational genius executed the seizure of power; the Provisional Government's failures created the opportunity; the Kornilov Affair resurrected the Bolsheviks from the July Days defeat. Within eight months, an obscure exile returning through a German sealed train ruled the Russian Empire. The transformation was rapid, unexpected, and consequential — the world's first communist government had taken power. The October Revolution would shape the twentieth century.