•Germany gathered an army of over 500,000 men, 10,000 guns and mortars, 2,700 tanks and assault guns and 2,500 aircraft.•The Red Army had almost 1,300,000 men, over 20,000 guns and mortars, 3,600 tanks, 2,650 aircraft and 5 reserve armies of another 500,000 men and 1,500 tanks.•The battle was fierce and had what is considered to be the largest tank battle in military history.•Ultimately, the USSR were victorious and Hitler’s hopes of successfully invading the USSR were essentially crushed.