A second problem that relates here is the other equipment that the artillery battery has, particularly its transportation. Much of the the German artillery particlarly late in the war was virtually immobile having no transportation to speak of. The aforementioned Volksartillerie Brigades were this way. They barely had sufficent equipment to place their batteries into static positions for an initial offensive or defensive operation. Once things became fluid these units either could not advance with the army to support them or were overrun in if the defense failed to hold. The Soviets generally gave their artillery sufficent transport to move their guns forward in an offensive even if they couldn't completely keep up. The US and British obviously had sufficent transport to give their artillery offensive mobility. This difference acts operationally as a force multiplier for each artillery unit. That is, a US self propelled artillery battalion could easily move where it was needed and support the units it had to whatever the battle situation might be. Motorized artillery likewise could usually be where it was needed. Horse drawn batteries were far more problematic. These couldn't keep up with a mechanized battle. They were just too slow and relatively immobile. Batteries that had barely enough transport to move their guns let alone ammuntion, manpower, and other equipment were of little value once the battle became fluid. So, a single self-propelled 105mm battalion might be worth several 208mm gun battalions that were only semi-mobile in modern warfare. This was because the 105 battalion was where it was needed and in range to fire far more frequently than the 208 battalions were.