Top 10 tanks facts

Soviets. Anti-tank dogs were taught to carry explosives to tanks. The original idea was for a dog to release the bomb and return to the operator, but it was unsuccessful and replaced by an impact detonation procedure. The U.S. military trained anti-tank dogs in 1943 for use against fortifications, but never deployed them.

Around 600. Polish Armed Forces did have around 600 tanks at its disposal. Mainly tankettes TK-3 and TKS but also 7TP, Renault FT, Renault R-35, Hotchkiss H-35 and couple of prototypes.

Battle of Cambrai. The battle incorporated many of the newer tactics of 1918, in particular tanks. The attack was an overwhelming success with light casualties in an extremely short amount of time.

To estimate total tanks production. The allies found out, that the gearbox numbers fell in two unbroken sequences, so large production resulted in influx of large serial numbers. Today, the problem of estimating the maximum of a discrete uniform distribution from sampling without replacement, is known - in the English-speaking world - as the German tank problem.

Great Britain. The first tank ever produced was Mark I in Great Britain.

Mitsubishi. Type 10 tank (pictured) is manufactured by Mitsubishi Heavy Industries, one of the core companies of the Mitsubishi Group. MHI is the world's 23rd-largest defense contractor measured by 2011 defense revenues, and the largest based in Japan.

Soviets. At that time, most of the armies used lighter and more efficient petrol engines, often taken from the aviation industry. Soviets, however decided to mass-produce diesel engines. There were several reasons: diesel fuel was less flammable and therefore safer, the Soviet Union had the huge aluminium forge capacity, and they didn't have large diesel-consuming fleet.

Battle of Kursk. From July 5, 1943 until August 23, the Germans conducted their last great attempt to regain the initiative on the Eastern Front. The fight has significantly weakened both sides of the conflict, however the result was decisive and strategic victory of the Soviet Union. The Battle of Kursk is considered the largest armoured battle in the world history.

Czechoslovakia. The Panz­erkampfwa­gen 38(t) was orig­i­nal­ly a Czechoslo­vak tank of pre-­World War II design. After Czecho­slo­va­kia was taken over by Germany, it was adopted by the German Army, seeing service in the in­va­sions of Poland, France and the USSR.

Vickers 6-Ton E . The 7TP was a Polish light tank of the Second World War. A development of the British Vickers 6-ton, it was significantly better armed than its most common opponents, the German Panzer I and Panzer II. A standard tank of the Polish Army during the 1939 Invasion of Poland, its production never exceeded 150 vehicles.