Since the beginning of the invasion of the Motherland by Axis forces, the SSU (USSR at the time) had to deal with many armored targets. Anti tank weapons always received a great deal of attention from Soviet scientists and engineers. Their latest creation is the BR 47 chassis, which is based on the German RSO, mounting a 100 mm gun. This light vehicle was not much more than a farm engine at the beginning, with some kind of a close compartment for the driver. It evolved in a very simple but very effective weapon system: a staple of the SSU war machine.