| January 19 (February 1) | Lenin’s articles “The Kind of ‘Unity’ Larin Proclaimed at the Swedish Congress” and “The Russian Brand of Südekum” appear in Sotsial-Demokrat No. 37. |
| January 27 (February 9) | Lenin writes a letter to the Nashe Slovo editors, and a draft declaration of the R.S.D.L.P. Central Committee for the London Conference of the Socialists of the Entente countries. He sends to M. M. Litvinov, the Russian representative on the International Socialist Bureau, a copy of the declaration to be read at the Conference. |
| February 10 (23) | Lenin addresses a joint protest meeting held in Berne by the Social-Democrats and trade union members, denouncing the arrest of the Bolshevik Duma deputies in Russia. |
| February 14-19 (February 27-March 4) | Lenin directs the Conference of the R.S.D.L.P. Groups Abroad held in Berne, makes a report on the central item of the agenda: “The War and the Tasks of the Party”, and drafts the Conference resolutions. |
| February 18 (March 3) | Lenin’s articles “How the Police and the Reactionaries Protect the Unity of German Social-Democracy” and “On the London Conference” are published in Sotsial-Demokrat No. 39. |
| Not earlier than February | Lenin writes the article “Under a False Flag”, which is first published in 1917 in the Collection of the Priliv Publishers in Moscow. |
| March 10 (23) | Lenin sends a letter to the editors of Nashe Slovo exposing the social-chauvinist views of the Menshevik Organising Committee and the Bund. |
| March 13-15 (26-28) | Lenin directs the work of the R.S.D.L.P. Central Committee’s delegation to the International Socialist Women’s Conference in Berne. |
| March 16 (29) | Lenin’s articles “The Conference of the R.S.D.L.P. Groups Abroad”, “What Has Been Revealed by the Trial of the Russian Social-Democratic Labour Group?”, “On the London Conference” and “The Slogan of Civil War Illustrated” appear in Sotsial-Demokrat No. 40. |
| March 22-24 (April 4-6) | Lenin directs the work of the R.S.D.L.P. Central Committee’s delegation to the International Socialist Youth Conference in Berne. |
| Not earlier than April 1 (27) | Lenin writes a conspectus of the report “May Day and the War”. |
| April 18 (May 1) | Lenin’s articles “The Social-Chauvinists’ Sophisms”, “The Question of the Unity of Internationalists” and “Bourgeois Philanthropists and Revolutionary Social-Democracy” appear in Sotsial-Demokrat No. 41. |
| Prior to April 19 (May 2) | Lenin gives directives to the Paris Bolshevik group on setting up a club of internationalist Social-Democrats to fight social-chauvinism. |
| April 22 (May 5) | Lenin approves the Dutch Socialists’ plan to bring out an international socialist magazine and gives practical advice concerning the publication, in foreign languages, of pamphlets against international social-chauvinism. |
| May 8 (21) | Lenin’s article “The Collapse of Platonic Internationalism” appears in Sotsial-Demokrat No. 42. |
| Prior to May 9 (22) | Lenin takes part in preparations for the publication of the magazine Kommunist. |
| May 12 (25) | The Committee Abroad of Social-Democracy of the Lettish Area invites Lenin to represent Lettish Social-Democrats at a conference of socialist parties of neutral countries. |
| May 19 (June 1) | Lenin’s article “On the Struggle Against Social-Chauvinism” appears in the Supplement to Sotsial-Demokrat No. 42. |
| Prior to May 24 (June 6) | Lenin leaves Berne and goes to the mountain village of Sörenberg (Switzerland). |
| Second half of May-first half of June | Lenin writes the article “The Collapse of the Second International”. |
| June-July | Lenin writes the articles “British Pacifism and the British Dislike of Theory” and “How Servility to Reaction Is Blended with Playing at Democracy”. |
| July 13 (26) | Lenin writes the article “The Main German Opportunist Works on the War”. |
| July-August | Lenin’s articles “The Defeat of One’s Own Government in the Imperialist War” and “The State of Affairs in Russian Social-Democracy” appear in Sotsial-Demokrat No. 43. |
| August 7 (20) |
Lenin establishes contacts, by correspondence, with Left internationalists and Social-Democrats in different countries with a view to uniting them for the forthcoming International Socialist Conference and instructs Bolshevik groups to get in touch with internationalists in different countries; he issues directives on the translation and publication of the Party’s main documents—the manifesto of the R.S.D.L.P. Central Committee on the war, Berne Conference resolutions, etc.; he forwards to Scandinavia his “Draft Declaration of the Zimmerwald Left” for translation into the Swedish and Norwegian languages and subsequent distribution among Left Social-Democrats in Sweden and Norway; he writes the articles “The ‘Peace’ Slogan Appraised” and “The Question of Peace”, and the pamphlet “Socialism and War”. Lenin receives his mandate as the Lettish Social-Democratic Party’s delegate to the Zimmerwald Socialist Conference. |
| August 10 (23) | Lenin’s article “On the Slogan for a United States of Europe” is published in Sotsial-Demokrat No. 44. |
| Prior to August 20 (September 2) | Lenin arranges for the publication of the pamphlet “Socialism and War” in German, and writes the “Draft Declaration of the Zimmerwald Left”. |
| August 20-22 (September 2-4) | Lenin comes to Zimmerwald to attend the International Socialist Conference. |
| August 22 (September 4) | Lenin directs a private conference of the Left Social-Democratic delegates to the Zimmerwald Socialist Conference, and speaks at the Conference on the character of the war and the tactics of international Social-Democracy. |
| August 23-26 (September 5-8) | Lenin takes part in the work of the Zimmerwald Conference, and organises and rallies its Left wing. |
| Between August 23 and 26 (September 5-8) | Lenin’s pamphlet “Socialism and War” comes out in German, and is circulated among delegates to the Zimmerwald Conference. |
| August 29-30 (September 11-12) | Kommunist No. 1-2 carries Lenin’s articles “The Collapse of the Second International”, “The Voice of an Honest French Socialist” and “Imperialism and Socialism in Italy (A Note)”. |
| August | Lenin writes “An Appeal on the War”. |
| Summer | Lenin writes the article “We Are Thankful for Such Frankness”. |
| Not earlier than September 12 (25) | Lenin sends a letter to the International Socialist Committee. |
| Second half of September | Lenin writes the article “The Defeat of Russia and the Revolutionary Crisis”. |
| Between September 18 and 23 (October 1-6) | Lenin returns to Berne from Sörenberg. |
| September 28 (October 11) | Lenin’s articles “The First Step” and “Revolutionary Marxists at the International Socialist Conference, September 5-8, 1915” appear in Sotsial-Demokrat No. 45-46. |
| Autumn, not earlier than September 28 (October 11) | Lenin writes the article “Kautsky, Axelrod, and Martov—True Internationalists”. |
| September 30 (October 13) | Lenin’s article “Several Theses. Proposed by the Editors” appears in Sotsial-Demokrat No. 47. |
| September | Lenin draws up a plan for the publication of a series of anti-war leaflets; edits Alexandra Kollontai’s pamphlet “Who Needs the War”, sends 500 copies of “Socialism and War” in German to Kollontai in Scandinavia for distribution there and instructs her to arrange for the English-language publication of the pamphlet in America. |
| Not earlier than October 16 (29) | Lenin writes the article “The Revolutionary Proletariat and the Right of Nations to Self-Determination”. |
| Late October | Lenin arranges for the publication of the draft resolution and the Manifesto of the Zimmerwald Left in German and French, and instructs Kollontai to get them published in America in English. |
| November 2 (15) | Lenin is invited to attend the meeting of the Executive of the Swiss Social-Democratic Party, held on November 20, 1915. |
| November 7 (20) | Lenin’s articles “On the Two Lines in the Revolution” and “At the Uttermost Limit” appear in Sotsial-Demokrat No. 48. |
| Prior to November 9 (22) | Lenin sends a letter to the secretary of the Socialist Propaganda League in the U.S.A. |
| December 8 (21) | Lenin’s article “Social-Chauvinist Policy Behind a Cover of Internationalist Phrases” appears in Sotsial-Demokrat No. 49. |
| 1915 | Lenin writes the book “New Data on the Laws Governing the Development of Capitalism in Agriculture. Part One. Capitalism and Agriculture in the United States of America”. |
| End of 1915 | Lenin writes the article “Opportunism and the Collapse of the Second International”. |
| December 1915-late January 1916 | Lenin lives in Berne, Switzerland. |
| Mid-December 1915 | Lenin holds a meeting of Social-Democrat internationalists to discuss preparations for the Second International Socialist Conference. |
| December 29, 1915 (January 11, 1916) | Lenin sends Maxim Gorky the manuscript of his book, New Data on the Laws Governing the Development of Capitalism in Agriculture, for publication in Petrograd. |
| December 29, 1915-June 19, 1918 (January 11-July 2, 1916) | Lenin works on his Imperialism, the Highest Stage of Capitalism at the Berne and Zurich libraries. |
| December 1916 |
Lenin writes a preface to Bukharin’s pamphlet, Imperialism and the World Economy. In a letter to the Geneva section of the Bolsheviks Lenin points out the need for a special resolution condemning the Mensheviks’ fraudulent elections to the “workers’ groups” under the war industries committees in Petrograd. |
| December 1916-January 1917 | Lenin is editor of the R.S.D.L.P.’s Central Organ, Sotsial-Demokrat. |
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