[b]KV-1 (USSR) vs Crusader (UK)
KV-1[/b]

Max Speed: 22 mph (35km/h)
Range: 156 miles (250km)
Vertical Obstacle: 3’8’’ (1.2m)
Trench: 8’6’’ (2.8m)
Length: 20’7’’ (6.27m)
Width: 10’2’’ (3.1m)
Height: 7’11’’ (2.41m)
Weight: 104,719lb (47,500kg)
Ground Pressure: 10.68lb/sq in (0.75kg/sq cm)
Armour: 2.95’’ - 3.94’’ (75 - 100mm)
Armament: 1x 76.2mm gun (various types used), 3x 7.62mm DT MGs.
Ammunition: 114x 76.2mm, 3,024x 7.62mm
Service History: Soviet Army 1940 - 1945
At the outbreak of WW2, the Soviet Army was practically the only one in the world armed with a production heavy tank. Production of the KV-1 began in 1940 and the type was first used in combat in February 1940 when a platoon was sent to Finland for combat testing and took part in the break through the Finnish front line with no KV-1s lost, despite heavy losses to multi-turretted heavy tanks accompanying them.
By the time of the German invasion in June 1941, the Soviets had 638 KV-1s in service and they came as a rude surprise to the Whermacht who were mostly equipped with light 37mm anti-tank guns incapable of harming the KV-1 without a lucky shot.
To provide heavy artillery support to the normal KV-1, a self propelled gun model (KV-2) was produced, mounting a huge box turret with a 152mm howitzer with 36 rounds of 152mm ammunition carried. This turret serverely affected the performance of the tank however and the KV-2 was soon dropped.
The KV-1 stayed in production though, and succesive models received heavier armour and a longer barelled gun. Some welded components were also replaced with casted parts to simplify production.
Front line experience showed that the KV-1 was too slow and a new lighter and faster model, the KV-1s, was adopted in 1942. As the need for heavier armament became apparent, the 85mm gun was adopted in 1943 to produce the KV-85.
Subsequent attempts to improve the KV series led to a large number of experimental tanks, but it was eventually replaced by the IS- series of tanks.
Crusader

Max Speed: 27mph (43.2km/h)
Range: 100 miles (160km)
Vertical Obstacle: 2’3’’ (0.685m)
Trench: 8’2’’ (2.59m)
Length: 19’8’’ (5.99m)
Width: 8’8’’ (2.64m)
Height: 7’4’’ (2.23m)
Weight: Crusader I and II: 42,560lb (19,279Kg), Crusader III: 44,240lb (20,040Kg)
Ground Pressure: 14.79lb/sq in (1.04Kg/sq cm)
Armour: Crusader I: 0.28 - 1.57’’ (7 - 40mm), Crusader II: 0.28 - 1.93’’ (7 - 43mm), Crusader III: 0.28 - 2’’ (7 - 51mm)
Armament: Crusader I&II: 1x 2pounder gun and 2x 7.92mm BESA MG, Crusader III: 1x 6pounder gun and 1x BESA MG
Ammunition: Crusader I: 110x 2pounder and 4,500x 7.92mm, Crusader II: 130x 2 pounder and 4,500x 7.92m, Crusader III: 65x pounder and 5,000x 7.92mm
Service History: British Army from 1939 to 1943
The Crusader was developed from the Convenanter and entered service in 1939. It was fitted with Christie suspension (possibly the best point of the tank) which allowed speeds of much higher than the official top speed of 27mph. In the Western Desert, mechanics often removed the engine governors and let the Liberty engine run as fast as it could, often allowing the tank to travel at 40mph or more, with the crew still being comfortable - although the engine could not take that much strain for too long.
The Crusader was rushed into service too quickly, and the in the first engagements (during Operation Battleaxe in 1941), more Crusaders were lost to mechanical breakdown than enemy action. These problems were eventually ironed out and the Crusader went on to fight in all of the major engagements in the Western Desert. By El-Alemain, the 6pounder armed Crusader III was in service giving the Crusader a better anti-armour performance. There was also a support version, armed with a 3inch howitzer, to give HE support to the combat tanks.
By the end of the desert campaign, the Crusader was outdated as a battle tank, and although a few went to Italy they were gradually phased out. Some hulls did stay in service after 1943 as AA vehicles or gun towers, but they never fought on the front lines again.
Although the Crusader had been a popular tank with its crews, due to the high speeds and comfortable ride, it was always underarmoured and undergunned against German tanks.