Following the November Revolution in the last months of 1918, Grosz joined the Spartacist League, which was renamed the Communist Party of Germany (KPD) in December 1918. He was arrested during the Spartakus uprising in January 1919, but escaped using fake identification documents. In 1920 he married Eva Peters. In the same year he published a collection of his drawings, titled "Gott mit uns" ("God with us"), a satire on German society. Grosz was accused of insulting the army, which resulted in a 300 German Mark fine and the confiscation of the plates used to print the album.