During the war, Carter produced anti-war cartoons for the Labour Party's Herald Weekly and worked as a librarian in the Aeronautical Directorate. His work of the war period and its aftermath has much in common with the imagery of Apollinaire's The Little Car (August 31, 1914)

During the 1920's, Carter became a mystic and worked on illustrations for D.H. Lawrence's Apocalypse (1929).