The same squadrons fought alongside the elements of the German military in the area of Ukraine during summer 1941. According to aviation author Josef Krybus, on this front, moral amongst the Slovak pilots was low and no significant victories were achieved during their deployment. During 1942, one of these squadrons was redeployed to Slovakia to conduct anti-partisan operations. Over time, a combination of obsolescence, the lack of spare components and the old Czechoslovak air force's proprietary fuel mixture (BiBoLi, or some other mix of ethanol, benzol and petrol) finally relegated the surviving B-534s to performing the trainer role and other secondary duties during 1943.