The T-34 was the single most effective tank design of the Second World War. It was produced in larger numbers than any other tank and few subsequent tank designs escaped its revolutionary influences. When it originally entered combat in the summer of 1941, it was markedly superior to any tank in the German arsenal. The Wehrmacht was able to eventually counter the T-34 with heavier tanks like the Panther, Tiger and Royal Tiger, but the introduction of the improved T-34-85 and the new IS-2 restored Soviet superiority.