aircraft, to counter the Soviet raids near the Orel area. Initially, the night fighters were ineffective against the Soviet raids, until the deployment of their ground radar "eyes". Once the Germans had use of their radar, after the night of 17–18 July, Soviet losses increased sharply. Although the Germans flew only fourteen sorties that night, they claimed eight kills (of course, throughout the war, night or day, the number of kills claimed was inevitably significantly higher than the actual number shot down, regardless of nationality or aircraft type). On the night of 20–21 July, Captain (Hauptmann) Heinrich Prinz zu Sayn-Wittgenstein, commander of IV./NJG 5, claimed to have shot down three himself. The exhaust plume of the ASh-82 engine may have been a contributing factor; the engines lacked flame dampening exhausts, making their plume visible from a distance. Despite its losses, the 746th was re-designated as the 25th Long-Range Guards Aviation Regiment (GAPDD) on 18 September 1943 in recognition of its achievements. Removal from combat The loss of Pe-8s to all causes—mechanical, combat, friendly fire—had steadily increased from one aircraft per 103 flights in 1942 to one per 46 sorties in 1944. Despite the losses, production kept pace with need. The number of aircraft belonging to the 45th DBAD continued to rise; 20 were on hand on 1 January 1944 and 30 on 1 June. The Pe-8s flew 276 sorties in 1944 against such targets as Helsinki, Tallinn and Pskov. Aviation historian Yefim Gordon maintains that the Pe-8 flew its last mission on the night of 1–2 August 1944, but the Statistical Digest of the VVS contradicts this claim, showing 31 Pe-8s assigned to 45th DBAD on 1 January 1945 and 32 on hand on 10 May 1945. However, during this period the 45th DBAD only had three regiments, none of which used the Pe-8 as their primary aircraft, so while the 45th DBAD may have had Pe-8s, these may not have been in use as the primary combat aircraft. The 890th began to fly Lend-Lease B-25 Mitchells in the spring of 1944 and was itself re-designated as the 890th Bomber Aviation Regiment on 26 December 1944. The 362nd APDD was formed in early 1944 with four Pe-8s received from the other two regiments, but these were returned in the spring of 1944, when the regiment began to convert to the Lend-Lease Mitchells. Post-war use After the war, the Pe-8 was