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
AI Mk. IV radar delays in the new units. By May the issues with the Pye design were ironed out, and the FIU's testing revealed it to be superior to the Mk. IV, especially in terms of maintenance. An RAE report agreed. The first updated Mk. V sets arrived in April 1942 and were fitted to the de Havilland Mosquito as they became available. A Mk. V equipped Mosquito claimed its first kill on 24/25 June, when a Mosquito NF.II from No. 151 Squadron shot down a Dornier Do 217E-4 over the North Sea. In practice it was found that pilots had considerable difficulty