Like most Sabaton songs, this is a true story. From Wikipedia:
Nazi forces: 42,200 men, 350 tanks, 657 mortars, guns and howitzers and aerial support
Nazi Losses: Unknown, possibly 1500 dead. More than 10 tanks. Several armoured vehicles.
Polish Forces: up to 720 men (20 officers), Six 76 mm guns, 42 MGs, 2 anti-tank rifles
Polish Losses: Unknown, almost all (approximately 650 dead). 40 captured