For 10 points, name this battle of July 5, 1943, the largest tank battle ever known.
This battle occurred due to a salient in the Russian lines between Orel and Kharkov which the other side planned to break with Operation Citadel.  The heaviest fighting occurred around the small village of Prohorovka where the Totenkopf, Adolf Hitler and Das Reich SS units were deployed along with five Panzer divisions, Gross Deutschland and three infantry divisions against the Fifth Guards Tank army.  In the end the maneuverability of the T-34 was more useful than the heavy armor of the German Tiger tank and the German 586 tanks in the first day alone.  For 10 points, name this battle of July 5, 1943, the largest tank battle ever known.
This battle occurred due to a salient in the Russian lines between Orel and Kharkov which the other side planned to break with Operation Citadel.  
Kursk