The "Manifesto of the Communist Party" was written by Marx and Engels as the Communist League's programme on the instruction of its Second Congress (London, November 29-December 8, 1847), which signified a victory for the followers of a new proletarian line during the discussion of the programme questions. Marx and Engels began working together on the Manifesto while they were still in London immediately after the congress, and continued until about December 13 when Marx returned to Brussels; they resumed their work four days later (December 17) when Engels arrived there. After Engels' departure for Paris at the end of December and up to his return on January 31, Marx worked on the Manifesto alone.