 The 2nd Tank Army was launched through the breach in the German 4th Panzer Army's front between Parczew and Chełm, and bypassing Lublin attempted to find a crossing over the Vistula.It was supported by the First Polish Army, including its 1st Armoured Brigade.In a hasty encounter battle, the 1st Armoured Brigade was located in the first echelon of the 2nd Tank Army.