During the fall of France in the second world war my uncle was flying hurricanes at the age of 19. He arrived back off patrol, lined up on final behind another plane, and promptly shot down his first German, a Dornier. Yes, he had found the 'wrong' airfield. (What a rotten place to be shot down - think about it next time you are on finals!)
It is quite amazing how small Europe is, and how close together the airfields are. In 1942 the allies obtained a complete Focke Wolfe 190 which had lost its way over 8/8 cloud cover and landed in England, thinking it was France. 60 miles in the wrong direction at 400 mph only takes 9 mins!!
(Off topic, but interesting....one can often see airfields 50 miles away on a good day from 25,000 feet. So, during the Battle of Britain it would often have been possible to see German airfields in France, three minutes after takeoff, while still over Kent!)