When the war broke out, however, he volunteered for the army and also became an active revolutionary: in 1918 he joined the circle of left-oriented intellectuals in Vienna who recognized his artistic talent.
No, po izbijanju rata, dobrovoljno se javio u vojsku, što je označilo i njegovo revolucionarno djelovanje: 1918. u Beču se pridružio krugu lijevo orijentiraih intelektualaca koji su prepoznali njegov umjetnički talent.