In the tank of the Red Army troops had no connections of a higher level than the mechanized corps (Mechanized Corps). The Wehrmacht were formed four tank groups (Trp): 1st Trp as part of Army Group "South", the 2 nd and 3 rd as part of Army Group "Center" and the 4th Trp as part of Army Group "North" . In their structure there were two (4th and 3rd tank groups) or three (2nd and 1st Panzer Group) tank corps. 3. Artillery and mortars Cannon cannon artillery are divided into two main classes: guns and howitzers. The main external difference is the length of the barrel: the barrel guns have a long (40-50 gauge) from howitzers - short (20-30 gauge). Different length of the barrel causes determining the difference in the magnitude of muzzle velocity: 650-750 m / s from guns of 350-500 m / s from howitzers. Of course, the shell does not disperse itself barrel and propellant charge, which artillery cannon firing (main elements are artvystrelov projectile fuze and propellant charge) is much more powerful than in the howitzer artvystrelov. Large capacity (t. E. Greater weight of powder) cannon artvystrelov entails greater weight and dimensions of the gate, stem, otkatnika and all other units and gun units. As a result, the gun weighs several times greater than the same caliber howitzer. For example, the mass of the Red Army Howitzer M-30 caliber 122 mm weighed (in firing position, ie, excluding the weight of the artillery front end -.. Two-wheeled carts, on which the motion is based frame guns) 2 200 kg, and a cannon A-19 the same caliber of 122 mm in firing position weighed 7080 kg.