The M4 was basically designed as an infantry support tank , it was thin armored and carried a relatively small caliber main gun for greater speed and minimum fuel consumption. Though not on par with Germany 's heavy tanks like Tiger and Panther in terms of firepower and armor protection, M4 medium tank was famed for its reliability, mobility and ease of maintenance. It could be transported by rails, put into ships and carried all over the world. M4 was seen in almost every battlefield from 1942 onwards and had contributed much to the success of the Western Allies. 
 
M4A3 was probably the most important variant of the M4 tank series. For the early type a 75mm low-velocity main gun was installed and was housed a V8 450hp Ford engine. On Dec 16, 1944 , German Army launched the "Ardennes Offensive" (better known as the Battle of Bulge) along the 85-mile Ardennes front. The Americans were caught largely unprepared and suffered heavy losses initially. During the conflict (Dec.16, 1944 to Jan.30, 1945) the American soldiers had fought courageously in the bitter cold and the rugged M4A3 played a crucial role in support of the infantry and in the destruction of enemy armored vehicles.