The Moscow Station in Petrograd was the scene of a familiar ritual of the Revolution late on the night of March 20, 1917 — the triumphant return of exiled revolutionary leaders. The red banners on the locomotive from Irkutsk read “Train of the Social Democratic Deputies of the Second Duma.” On board were the legendary leader of the arrested Social Democratic faction, the Georgian Menshevik I. G. Tsereteli, and a group of his followers known as the Siberian Zimmerwaldists. They were experienced in revolutionary politics, closely knit, and completely dedicated to the policies and leadership of Tsereteli. Within ten days of their arrival in the capital, these men would take control of the bloc of Mensheviks and Socialist Revolutionaries which held the majority in the Executive Committee of the Petrograd Soviet and the First All-Russian Conference of Soviets. In the coming months they would provide effective, often forceful leadership for the Soviets, guiding them by a new and distinctive political strategy which they called Revolutionary Defensism.