On 1 November 1942 Jabs was appointed
Staffelkapitän of 11./NJG 1, where he would become friends with
Helmut Lent,
Heinz-Wolfgang Schnaufer,
Günther Radusch and
Martin Drewes. By the end of the year he had accumulated four victories as a nightfighter. With the addition of
FuG 202 Lichtenstein radar Jabs began having greater success locating British bombers. He became adept at the orthodox night fighter attack method of
von unten hinten, or from under and behind. This involved locating a weaving bomber and then approaching low and to the rear, hopefully avoiding being sighted by the bomber's rear gunner. When he had closed adequately he would assume a climbing attitude and fire at the bomber's undercarriage. In January 1943 the
Eighth Air Force began taking their daylight operations into Germany. Beyond the range of fighter escort, Bomber Command discouraged the idea, but the Eighth believed their aircraft would be able to fight their way through to the target. The initial raid was against
Wilhelmshaven. The
first attack on 27 January was conducted with 60
B-17s, and was met by resistance from
JG-1. The B-17s brushed the defenses aside and delivered their loads on Wilhelmshaven, while suffering the loss of 3 aircraft. Göring insisted that all aircraft, including the night fighter force, would be put into the air to resist these attacks against Germany. The second raid 4 February was mounted against the marshaling yards at
Hamm. Poor weather was a problem, and the mission was diverted to the industrial area of
Emden. JG 1 again responded, but this time they were joined by Jabs and his gruppe. Neither German fighter unit possessed the techniques of attack developed in northern France by
JG 2 and
JG 26, and had a difficult time engaging the bombers. Official Luftwaffe doctrine was to attack bombers from the rear and above. Against the heavily gunned B-17s, Jabs and his crews knew such attacks were suicidal. Several attacks from the beam were made, and eventually a break in the formation opened a gap which Jabs and his wingman took advantage of. Getting into the formation both made head on attacks and were each credited with the destruction of a B-17. Overall 5 B-17s were lost on the mission, one due to a mid-air collision with a
Fw 190, but of the 8 aircraft Jabs' gruppe put up, all 8 suffered significant damage. In battles against the 8th Air Force, losses in the night fighter force among Bf 110s mounted quickly. The special skills of the night fighters took considerable time to develop. Night fighter commanders and crews resented being sent on these missions, and felt it extremely wasteful. In two months the night fighters finally were withdrawn from the day battle. To improve his destructive power Jabs had his aircraft's forward armament replaced, changing from the two 20 mm cannons and four MG 17 machine-guns to a pair of
30 mm cannons. The heavier gun was more effective against Allied heavy bombers. He was credited with 3 bombers on the night of 19 February. He added another score in April 1943, bringing his total to 28. Jabs had a second armament modification made a few months later. Night fighter pilots had been asked to identify their targets before firing upon them to reduce friendly fire accidents. To their surprise, the night fighter pilots discovered they could fly below a heavy British bomber and remain out of sight and undetected. Soon pilots were asking for upward firing guns to be mounted in their aircraft. These modifications were largely done in the field. Jabs had a pair of upward firing 20 mm cannons mounted to his Bf 110. If he could locate the bomber he would approach from below, matching the weaving movement of the bomber. With the target confirmed Jabs would fire from below, aiming for the fuel cells in the right wing root between the fuselage and the inboard engine. This gun mounting they called
Schräge Musik or slanting music. The bombers shot down in this manner never saw their attacker. Its use remained unknown to Bomber Command for over a year. It was soon the preferred method of attack. Jabs scored 7 kills in June, bringing his total to 35. By the end of August he had reached 40. On 31 August 1943, he was awarded the
German Cross in Gold (). From the fall of 1943 through the spring of 1944 the battle for the night skies over Germany swung to the night fighters. Harris hoped to end the war by destroying Berlin. It was his last opportunity to do so before the Allied land forces would intervene in what could be a very costly land battle. Throughout that winter Harris attempted to win the
Battle of Berlin. During this period Jabs was frustrated with his inability to locate and track any bombers, and he reported no victories during this time. The
Nuremberg raid on 30/31 March 1944 was the last mission flown in the battle for Berlin. On 1 April Bomber Command was placed under the control of
Eisenhower and
SHAEF, and the force was turned to France to begin air preparations for the invasion. On 1 March 1944 Jabs was made the
Geschwaderkommodore of NJG 1, replacing
Werner Streib, who had been made Inspector of Night Fighters. Three weeks later, on 24 March 1944, Jabs was awarded the
Knight's Cross of the Iron Cross with Oak Leaves (). The presentation was made by
Adolf Hitler at the
Berghof, Hitler's residence in the
Obersalzberg of the
Bavarian Alps, on 4 April 1944. Also present at the award ceremony were
Gerhard Barkhorn, for the Swords to his Knight's Cross, and
Erich Hartmann,
Walter Krupinski,
Kurt Bühligen,
Horst Ademeit,
Reinhard Seiler, Dr.
Maximilian Otte,
Bernhard Jope and
Hansgeorg Bätcher from the bomber force, and the Flak officer
Fritz Petersen, all destined to receive the Oak Leaves. On 29 April 1944 Jabs paid a visit to fellow night fighter pilot
Heinz-Wolfgang Schnaufer and his Gruppe at
St. Trond Belgium. In mid-afternoon through cloudy and foggy skies Jabs made the short trip back to his home base at
Deelen. As Jabs approached Deelen he could see a small group of single engine fighters low over the airfield, which he took to be German. The aircraft, in fact, were from
No. 132 Squadron RAF, led by Squadron Leader
Geoffrey Page, who had taken a flight of Spitfires on a low level mission looking for enemy aircraft. The approaching twin engine fighter was just what Page was looking for. As Jabs continued his approach he saw the aircraft turn toward him. Realizing his mistake, he flew toward his attackers and through some cloud. Emerging on the other side he found himself approaching head on with the Spitfire of New Zealander John Caulton. As the two aircraft rapidly closed both began firing, but Jabs' twin 30 mm cannon took effect first, ripping open the Spitfire's drop tank and putting hits on the engine and wing. Flying past, the undamaged Spitfires regrouped and turned to make another attack. Jabs attempted to reach the cover of his airfield. As the Spitfires closed from behind, Jabs surprised them by turning back into them again. Both sides were firing as they closed. For a brief moment one of the Spitfires was caught by the heavy forward guns of the Bf 110. It was engulfed in fire and crashed to earth. Jabs' aircraft had also taken several hits, and was losing power in one of the engines. He made an abrupt hard landing, and with the aircraft still rolling he and the crew scrambled for cover while the airfield's Flak batteries attempted to drive off the attackers. Despite the fire from the field's defenses, the Spitfires strafed the Bf 110, setting it ablaze. As Caulton headed west in his damaged Spitfire a large gash opened on the wing. Soon he found his engine was running rough. He lost oil pressure, and as the engine overheated it soon seized up. Caulton had no choice but to put the aircraft down. He did so in a field about 30 miles away from the airfield at Deelen. Of the other four Spitfires that returned to England, all had suffered damage, either from Jabs or the Flak guns. After the air battle Jabs drove over to the site of Caulton's crash and inspected the stricken Spitfire. Then he and his crew came to the building where Caulton was being held. The two exchanged greetings, and Jabs, who spoke English, asked "Were you flying the Spitfire?" "Yes" Caulton replied. "Well, I was flying the other." They spoke together for a short time, and Caulton asked Jabs for a small signed note as a mark of their meeting. Jabs did so, adding a brief instruction that Caulton was to be allowed to keep it. ==End of the war==