Quote from Shaw's book on fighter tactics, taken from a post on this BB many years ago since I don't have the book in front of me right now:
"A plane was approaching and because of its long nose I thought it was a Mustang. Turning into it I received a shock, it was neither a Mustang nor an ME-109, but a new Focke-Wulf, its long nose was the latest improvement of the famed FW. These planes with the longer noses were rumored to have more horsepower than their predecessors, and were capable of giving Mustang a rough time. We met practically head-on and both of us banked our planes in preparation for a dogfight.
Around and around we went. Sometimes the FW got in close, and other times, when I'd drop my flap to tighten my turn, I was in a position to fire, but the German, sensing my superior position, kept swinging down in his turn, and gaining airspeed and quickly pulling up, and with the advantage in height he would then pour down on my tail. Time was in his favor, he could fight that way for an hour and still have enough fuel to land anywhere below him. I still had 400 miles of enemy territory to fly over before I could land. Something had to be done. Throwing caution to the wind I lifted a flap, dove and pulled up in a steep turn, at the same time dropping a little flap. The G was terrific, but it worked, and I had the Jerry nailed for sure. Pressing the tit I waited, but nothing happened, not a damned thing. My guns weren't firing.
By taking this last gamble I had lost altitude but had been able to bring my guns to bear while flying below the FW. With his advantage of height he came down, pulled up sharp, and was smack-dab on my tail again. The 20 mm. cannons belched and I could see what looked like golf balls streaming by me. A little less deflection and those seemingly harmless golf balls would have exploded instantly upon contact with my plane. "Never turn your back on an enemy" was a byword with us, but I had no choice. Turning the plane over on its back I yanked the stick to my but. My throttle was wide open and I left it there as I dove. The needle stopped at 600 miles per -- that was as far as it could go on the dial. Pulling out I expected at any minute to have the wings rip off, the plane was bucking so much. The last part of the pull-up brought me up into clouds. I was thankful to have evaded the long-nosed FW, for that pilot was undoubtedly the best that I had ever met."
-John Godfrey, Mustang ace