10 most difficult tanks riddles

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.

Switzerland - unlisted here - has the most, 380. Greece is second with 340 than Turkey with just a few less. What's interesting, Germany has the least of them with around 100 less than Greece.

The T-34 was the mainstay of Soviet armoured forces throughout the Second World War. Its design allowed it to be continuously refined to meet the constantly evolving needs of the Eastern Front: as the war went on it became more capable, but also quicker and cheaper to produce.

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.

The Type 97 ShinhoTo Chi-Ha was a Japanese medium tank used in World War II that was an upgrade to the original Type 97 Chi-Ha. The new version was designated Type 97-Kai ("improved") or Shinhoto Chi-Ha ("new turret" Chi-Ha). This design was probably the best tank Japan produced in any large quantity up to 1945.

In September 1943, all surviving Ferdinands were recalled to be modified based on battle experience gained in the Battle of Kursk. During October and November 1943, 48 of the 50 surviving vehicles were modified by addition of a ball-mounted MG 34 machine gun.

The tank presented in this picture is a KV-85, the last of KV series (from the surname of soviet marshal Kliment Voroshilov). As the name suggests it had a 85 mm gun. Only 148 of them were built.

The Mk III Valentine was an infantry tank produced in the United Kingdom during the Second World War. More than 8,000 of the type were produced in eleven marks, plus various specialised variants, accounting for approximately a quarter of wartime British tank production.

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.

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.