A platoon of three was assigned to the Mobile Group that joined the Germans in Operation Barbarossa on 24 June 1941. Two more were added when the Mobile Group was reinforced and redesignated as the Mobile Brigade on 8 July. The only serious combat encountered by the Slovak armor was at Lipovec in late July where they failed to dislodge the Soviet 44th Mountain Rifle Division from its positions. One OA vz. 30 was destroyed during this battle and two others were heavily damaged. All of the armored cars were withdrawn together with all the other armored vehicles and returned to Slovakia in early August.Kliment and Nakládal, pp. 71–72 A company of six OA vz. 30s was sent to reinforce the Security Division on anti-partisan duties in Ukraine in August 1942. Two were destroyed in combat and there was only one running when the survivors were withdrawn back to Slovakia on 12 January 1943. Once the Panzerkampfwagen IIs that the Ministry of Defense had ordered to replace them arrived in January 1944 they were put into storage although they were still carried on the books.Kliment and Nakládal, pp. 43–46 They saw some use by the insurgents when the Slovak National Uprising began in September 1944, but little is known of their activities.
