crew claimed aerial victories 45 to 47. Bomber Command had sent 561 Lancasters and 314 Halifax four-engined bombers, supported by de Havilland Mosquito night-fighters and bombers, destined for Berlin. Schnaufer, who had been suffering from stomach pains all day, and his crew returned to Leeuwarden at 00:14. Rumpelhardt had been the first to congratulate him on his birthday over the intercom. Their fellow airmen had prepared a birthday celebration. The stomach pains had become unbearable and Schnaufer was taken to a hospital with appendicitis. He stayed in the hospital for about two weeks before, together with Rumpelhardt, he went on vacation back home. Carelessly lifting his suitcase, he burst his stitches, resulting in further hospitalisation. He flew his first mission after these events on 19 March 1944. Group commander of the IV./NJG 1 Schnaufer was appointed Gruppenkommandeur IV./NJG 1 on 1 March 1944, taking over command of the Gruppe from Jabs who was given command of NJG 1. He was promoted to Hauptmann on 1 May 1944. Schnaufer became an ace-in-a-day for the first time on 25 May 1944 when he claimed five RAF bombers shot down between 01:15 and 01:29 for victories 70 to 74. The bombers had targeted the railway marshalling yard at Aachen. On 6 June 1944, the Western Allied forces landed in Normandy, during Operation Overlord. In support of the invasion of Normandy General Dwight D. Eisenhower, the Supreme Allied Commander, assigned Bomber Command to support the ground forces. On the night of 12/13 June, Schnaufer claimed his first victory following the invasion when 671 bombers attacked various railway targets in France. Schnaufer claimed three bombers shot down that night, the first as a Lancaster and the second and third as a Lancaster or Halifax, between 00:27 and 00:34. Hauptmann Schnaufer was awarded the Knight's Cross of the Iron Cross with Oak Leaves () on 24 June following four aerial victories claimed on 22 June, which took his total to 84 victories. For Schnaufer, July 1944 was less successful than the previous three months. He claimed two bombers on the night of 20/21 July and three on 28/29 July, taking his total to 89 aerial victories. One day later, on 30 July, he received a letter from Göring telling him that he had been awarded the Knight's Cross of the Iron Cross with Oak Leaves and Swords (). Hitler himself made the presentation. It is said