the lxviii corps of the 2nd panzer army made the main thrust south of lake balaton on march 6 with an attack against the soviet 57th army and the bulgarian iii corps' 10th division. with three infantry divisions (the 16th was redeployed to assist the iv corps) aided by a thaw that caused muddy ground, the bulgarians held as did the 57th army. although the lxviii corps (also called "group konrad" for this operation) attacked across a 10-kilometer wide front, it failed to penetrate the soviet and bulgarian defenses and had to be content with pinning down the soviets and bulgarians in this region. by march 12, lxviii corps had moved the axis of its attack against the 57th army and managed to penetrate some 10 kilometers into the soviet defense before bogging down.