The Red Army, with assistance from Romanian army units, completed the encirclement of Budapest on 29 December 1944 and the Siege of Budapest began. On 2 February 1945, the strength of the Royal Hungarian Army was 214,465 men, but about 50,000 of these had been formed into unarmed labor battalions. The siege of Budapest ended with the surrender of the city on 13 February. But, while the German forces in Hungary were generally in a state of defeat, the Germans had one more surprise for the Soviets.