 The Allies prevailed, but at the cost of over half their tanks; 20 percent of the losses were caused by mines.The Soviets learned the value of mines from their war with Finland, and when Germany invaded, they made heavy use of them, manufacturing over 67 million.At the Battle of Kursk, which put an end to the German advance, they laid over a million mines in eight belts with an overall depth of 35 kilometres.