Brusilov Offensive
Janoušek was then transferred to the Eastern Front to resist the Russian Brusilov Offensive. Russian forces captured him on 2 July 1916 and detained him in a prisoner-of-war camp near Kiev, Ukraine. However, on 1 August 1916 Janoušek was released to join the II Volunteer Division of the Serbian Army in Odessa, which recognised his Austrian rank of corporal.