Halifax was shot down over Duras, killing everybody save one on board. The second Stirling was shot down over Schaffen Airfield, with all aboard losing their lives. In June 1943, Schnaufer filed claims for a further five aerial victories. Schnaufer and Baro were scrambled on 11/12 June in Bomber Command's attack on Düsseldorf, and on 16/17 June in defence of Cologne. However, in both missions they failed to make contact with the enemy. Their next success came when they shot down a Stirling from No. 218 Squadron on 22 June 1943 at 01:33. With Baro on the radio and radar, they managed another victory over a Wellington on 25 June 1943 at 02:58. On 29 June 1943, the two shot down three bombers in another attack on Cologne, a Lancaster and two Halifax bombers at 01:25, 01:45 and 01:55 respectively. This brought the number of aerial victories he was credited with up to seventeen. Schnaufer was promoted to Oberleutnant (first lieutenant) on 1 July 1943. He had been eligible for this promotion since April 1943, why he was overlooked at the time remains unknown. Schnaufer claimed his last two aerial victories with Baro operating the radio on the night of 3/4 July, Bomber Command had again targeted Cologne. Their victims were a No. 196 Squadron Wellington shot down at 00:48 and a No. 149 Squadron Stirling at 02:33, bringing his total to 19 victories. His next radio operator was Oberleutnant Freymann, the signals operator of II. Gruppe. Under Himmelbett control they shot down a No. 49 Squadron Lancaster, on another Cologne bombing mission, on 9 July 1943 at 02:33. He was awarded the Honour Goblet of the Luftwaffe () on 26 July 1943. In mid-July, the Battle of the Ruhr was coming to an end and Bomber Command refocused its efforts on the port city of Hamburg in northern Germany. The codename for the attack was Operation Gomorrah; the objective was the destruction of Hamburg. The operations began on 24 July 1943 and during four major night-attacks by the RAF and two minor day-attacks by United States Army Air Forces (USAAF) between 40,000 and 50,000 civilians were killed. To counter the mounting success of the German night fighter force, which was directly attributed to the introduction of the Lichtenstein radar, the RAF introduced Window (Chaff or Düppel to the Germans). Window was a radar countermeasure in which aircraft spread a