reacted and succeeded in reaching the bombers. II./ZG 1 reported contact near Klagenfurt and reported numerous victories. 19 B-17s and 21 Consolidated B-24 Liberators were destroyed. P-38 fighter groups could claim only one victory for three losses. By mid-June 1944, ZG 1 was based in Vienna, part of 8. Jagddivision. On 13 June 1944, II./ZG 1, with I./JG 300, I./JG 302, I./ZG 76 claimed 20 B-24s one P-38, two P-51 Mustangs. Actual losses were nine B-24s, two B-17s, seven P-38s and one P-51. US fighters claimed 40; 16 German and Royal Hungarian Air Force fighters were lost. On 26 June 1944, the Fifteenth sent 677 bombers to attack six oil refineries. II./ZG 1 and JG 300 were ordered to intercept the bomber stream heading to Moosbierbaum. 27 Bf 110s of II./ZG 1 observed the 304th Bombardment Wing begin its bomb run, and noticed the 455th Bombardment Group far out from the main stream. They attacked head-on and achieved several successes before 61 fighters from JG 300 attacked. The 455th Group lost 10 B-24s, its worst day of the war. II./ZG 1 claimed four but lost five killed, two wounded, and four Bf 110s. On 27 June II./ZG 1 and I./ZG 76 intercepted the 460th Bombardment Group on a raid to Budapest and shot down four over Lake Balaton. Another attack on the city on 2 July involved 22 of the group's aircraft. Though the unit only lost one fighter it claimed no victory. Other units suffered high losses. In mid-1944, the RLV (now Luftflotte Reich) made several organisational changes. I./ZG 1 ceased to exist and became II./JG 4, with the heavily armed "sturm" Fw 190 A-8/R-2. A Bf 109 G group was formed from III./ZG 1, which was disbanded and formed as III./JG 4. It took time to convert the ex-ZG 1 pilots onto Fw 190s and Bf 109s. By the end of July 1944 most of the Zerstörergeschwader were no longer operational and had been converted to single-engine fighter units. The last surviving ZG 1 unit, II. Gruppe ZG 1 became III./JG 76, which had been formed mostly from ZG 76. Commanding officers Major Arved Crüger, 4 January 1942 – 2 March 1942 Major Ulrich Diesing, 3 March 1942 – 21 September 1942 Oberstleutnant Ralph von Rettberg (acting), 22 September 1942 – 5 October 1942 Oberstleutnant Paul-Friedrich Darjes, 6 October 1942 – 1 March 1943 Oberstleutnant Alfred Druschel (acting),