Junkers Ju 87 attack of the war. The Stukas attacked 11 minutes before the official German declaration of hostilities and hit the targets. The Ju 87s achieved complete success. The mission failed as the German Army delayed their advance allowing the Poles to carry out repairs and destroy all but one of the bridges before the Germans could reach them. A Ju 87 achieved the first air victory during World War II on the morning of 1 September 1939, when "" "Leutnant" Frank Neubert of I./StG 2 "Immelmann" shot down a Polish PZL P.11c fighter while it was taking off from Balice airfield;
Junkers J 2 spin on 23 September 1916 in one of the J 2s, and this event, combined with the substandard climbing performance of the J 2 series of test aircraft, caused "IdFlieg" to withdraw any further governmental support (effectively ending the J 2's contract) for the Junkers firm's advanced monoplane designs until a lighter metal, such as duralumin, was selected for such designs. The first attempt to use duralumin for airframe construction by the Junkers firm was the never-completed J 3 mid-wing, rotary engine-powered, aluminum tubing fuselage single-seat monoplane design, of which only the corrugated sheet duralumin-covered wing structures and "bare" tubular