No accounts posted here of anything other than US planes deploying flaps at higher speeds that I've seen.
From JG 26 - Top Guns of the Luftwaffe, by Donald L. Caldwell (Ivy Books, New York 1991), ISBN 0-8041-1050-6 (First Ballentine Edition, June 1993), at page 276:
[The following occurred on the afternoon of September 17, 1944 - the first day of Operation Market-Garden]:
The Third Gruppe [of JG26] also fought a battle with Mustangs, with ruinous consequences for itself. In mid-afternoon, Major Mietusch assembled about fifteen Bf 109s of his scattered command and headed for the landing zones, climbing all the way. The weather had taken a turn for the worse, and there was a continuous layer of thin cloud at 15,000 feet. The Germans climbed through it, and then, while above the Dutch-German border, Mietusch spotted a squadron of P-51s below them. He radioed, “Otter Mietusch, I am attacking!” and dove through the cloud. His first burst of fire destroyed the Number 4 plane of the trailing cover flight. Oblt. Schild hit the Number 2 Mustang’s drop tank, and it dove away trailing a solid sheet of flame. The events of the next few minutes are best stated in the words of the leader of that P-51 flight, Lt. William Beyer of the 361st Fighter Group’s 376th Squadron:
* * *
I was the flight leader at the tail end of the squadron. We had flown back and forth between checkpoints for a couple of hours. My wingmen apparently got tired of looking around for enemy aircraft. Only by the grace of God did I happen to look behind us at that particular moment, because in no more than a couple of seconds the enemy would have shot the whole flight down.
I saw about fifteen German fighters closing fast with all their guns firing. I immediately broke 180 degrees and called out the enemy attack. My Number 4 man went down in flames, and my wingman got hit and spun out. I headed straight back into the German fighters and went through the whole group, just about in the center of them. We were separated by only a few feet...
I immediately made another 180-degree turn, picked out one of them, and started to chase it. The rest of the fighters zoomed back up into the clouds and disappeared. We made many violent high-G maneuvers with wide open throttle. When I started to close and fire, I noticed that his plane seemed to have stopped in the air. I had to decide whether to shoot and run, or to try to stop my plane. I cut throttle, lowered flaps, and dropped my wheels - I still kept closing. I had to fishtail and do flat weaves to stay behind him. This maneuver was repeated three times, and on one occasion I almost cut his tail off, we were so close...
Then we started into steep dives. The last one was at around 1,000 feet with flaps down. This last maneuver was deadly and nerve-racking. He went straight down toward the ground, hoping I couldn’t pull out. If I pulled out early, he could have come in behind me, so I stayed with him. If we had had our wheels down when we pulled out, we would have been on the ground.
It was after this pullout that I finally was able to get my sights lined up and fire at him. I must have hit him with the first burst, because he kept turning and went into the ground and broke up. Knowing the caliber of this German pilot, I am sure that if I had taken the time to get off some shots when he was slowing down he could have possibly shot me down or made a getaway. My other combat victories were not nearly as spectacular as this one, and it is with this in mind that I can recall it so vividly.
* * *
Lt Beyer’s victim was Klaus Mietusch. Mietusch was one of the most fascinating individuals in the Geschwader’s history. He was a career officer, had joined the Geschwader in 1938, and was its senior pilot in length of service when he died at age twenty-five. His early combat career was marked by a seemingly endless series of failures and frustrations. A member of the successful 7th Staffel under Muencheberg, he did not come into his own until he succeeded to the command and led it on detached assignment in Russia in 1943. He was the opposite of the typical extroverted, self-confident fighter pilot. He compensated for what he believed to be his lack of ability by an act of will. According to Priller, Mietusch’s combat motto was, “Bore in, until the enemy is as large as a barn door in your sights.” Again quoting Priller, duty as Mietusch’s wingman was an “unforgettable experience.” Mietusch was shot down ten times and was wounded at least four times. He was said never to have turned down a mission, and he had logged an incredible 452 combat sorties at the time of his death. His seventy-two victories brought the award of the Oak Leaves to his Knights’s Cross, two months after his death.
