 Complete the following phrase:  World War II in Europe began on Friday, 1 September 1939, when German forces invaded Poland. In preparation, 5.186 had been moved to Brüsterort, near Königsberg on 22 August. In the early morning hours of 1 September, 5.186 flew its first combat missions, providing fighter protection for 4.186 attacking the naval base of the Polish Navy at Hel and for the old German battleship Schleswig-Holstein bombarding the Polish military transit depot at 