Panzer I it still performed much useful service against entrenched infantry and other "soft" targets, which were unable to respond even against thin armor, and who were highly vulnerable to machine gun fire. The small, vulnerable light tank, along with its somewhat more powerful successor the Panzer II, would soon be surpassed as a front-line armoured combat vehicle by more powerful German tanks, such as the Panzer III, and later the Panzer IV, Panzer V, and Panzer VI; nevertheless, the Panzer I's contribution to the early victories of Nazi Germany during World War II was significant. Later in that war the turrets
Mk 2 grenade EC powder. The improved "Mk 2A1" (a designation used informally by armorers, historians, and collectors but was never officially by the US military) introduced in 1942 was filled through the fuse well instead. The Mk 2A1 was initially filled with of EC powder. In 1944, the EC powder filling was replaced with of TNT. Low explosive-filled Mk 2s had their cast iron bodies painted gray or black to prevent rust. Pre-WWII high explosive-filled Mk 2s were painted bright yellow. During wartime (from about 1943 onwards), grenades were overpainted in olive drab, leaving a narrow yellow ring remaining at the top.