The LeFH18 proved to be a sounding design with both reliability and accuracy, had served widely in many artillery regiments throughout WWII, forming the backbone of German divisional field artillery. The LeFH18 used separate-loading propelling charges, between one and six depending on the desired range. However, its maximum firing range of only 10675m made it no match for its Soviet counterpart. Its heavy weight also made it unable to be truly mobile, often resulting itself being abandoned in the muddy terrain of Russian Front. When first confronted with the Soviet T-34, KV-I and KV-II tanks in 1941, German anti-tank weaponry was quickly found to be inadequate. One of the only guns capable of destroying these Soviet tanks was the LeFh18. The LeFH18M was a modified version of the LeFH18. It features a new muzzle break, powder capacity was also increased, extending its mamimal firing range to 12,325m. Some improvement was also made on the recoiling system. The LeFH18M began to serve in frontline units from 1940. Other than the standard towed version, they were also adapted as main armament of several light-weight self-propelled guns, which remained on first-line service until the end of WWII.