 The 1st Polish Infantry Regiment was split up into "combat teams" supporting the 19th and 35th Mechanized Brigades, with the 2nd Polish Infantry Regiment supporting the 219th Tank Brigade; all units of the Soviet 1st Mechanized Corps.Upon arrival, the Polish forces found that the Soviet units had suffered tremendous losses; the 19th and 35th Mechanized Brigades had sustained over 90% casualties, and thus the Polish 1st Infantry Regiment originally assigned to support them had to, in effect, take over their tasks.The 66th Guards Tank Brigade of the 12th Corps that received the 3rd Polish Infantry Regiment for support had similarly taken heavy losses, having already lost 82 tanks due to insufficient infantry cover.