15th Tank Corps

The 15th Tank Corps (Russian: 15-й танковый корпус, 15-y tankoviy korpus) was a tank corps of the Soviet Union's Red Army. It formed in 1938 from a mechanized corps and fought in the Soviet invasion of Poland, during which it participated in the capture of the Grodno and Augustów Forest from Poland. The corps was disbanded in January 1940 at Vilnius and Šalčininkai in Lithuania.

In 1942, the corps was reformed under the command of Major General Vasily Koptsov and became part of the 3rd Tank Army. It first saw combat in the unsuccessful Kozelsk Offensive of late August and early September, a relatively small operation to encircle a German salient, which resulted in the corps taking heavy losses in proportion to the territory gained. After spending the rest of the year in reserve, receiving new supplies and equipment, the corps was transferred to the southern front in southwestern Russia to fight in the Ostrogozhsk–Rossosh Offensive during January 1943, in which it played a major role by forming part of the forces that encircled thousands of Axis troops on the middle reaches of the Don River.

In February 1943, the unit fought in Operation Star, achieving its objective of recapturing the key city of Kharkov in eastern Ukraine. As the Soviet advance outran its supply lines, the corps was slowly worn down and was virtually destroyed after being surrounded by a German counteroffensive in the Third Battle of Kharkov during late February and early March. Koptsov was among those killed in the fighting. The corps was rebuilt in the following months and became part of the newly created 3rd Guards Tank Army, fighting in Operation Kutuzov, the Soviet counteroffensive during the Battle of Kursk, in late July. For its actions in the offensive, the corps was converted into the 7th Guards Tank Corps.