On 1 July 1943, "Jagdgruppe Nord des ObdL" was formed as a high-altitude fighter unit to combat the RAF's Mosquito twin-engine bomber and reconnaissance aircraft. On 15 August 1943 the unit was redesignated "Jagdgeschwader 25" and was commanded by "Oberstleutnant" Herbert Ihlefeld. Both JG 25 (and its sister unit "Jagdgeschwader" 50) were ultimately unsuccessful in effectively countering the Mosquito and were more profitably used for interception of the US heavy bomber formations during the daylight offensive over Europe in 1943–44. The Geschwader claimed only two aerial victories for the loss of 9 aircraft lost in combat and further 5 losses due to other reasons.