 Nevertheless, on May 8, the Novospasovskaya group joined the RIAU, Belash was elected chief of staff of the army, from May 29, he simultaneously served as a member of the Council of Revolutionary Rebels (PSA), deputy chairman of the PSA and head of its operations department.In June - August 1920 - he was a member of the editorial board of the newspaper "Rebel".He participated in the RIAU raids, as the chief of staff, developed plans and issued orders on the movement of units, and was wounded several times in battles.