Soviet Union's BT-5 Bystrochodnij Tankov (Fast Tank) photo added

The Soviet Union seemed to have realized the potential for armored tanks much earlier than many of the countries of the world in the early 20th century. They were quite advanced on their designs and just sheer numbers of tanks produced. One of those early designs was the BT-5 Fast Tank which was produced in large numbers. Despite the vast quantities of tanks that the Soviets had, numbers didn't make up for training.