France also produced what may have been the best tank of the 1930s, the SOMUA S35. This tank equipped the armoured divisions of the Cavalry which had to execute the exploitation phase of a battle and was probably the best combination of armour, firepower and mobility prior to the appearance of the German PzKpfw IV Ausf. F2 and Soviet T-34. The S 35 had a long 47 mm gun that could kill any tank then in service, as well as heavy cast armour and good speed.