Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: The tail fin of a German plan that was flown during the Second World War by the world's deadliest-ever fighter pilot is to go up for auction. The bullet-ridden section of the Messerschmitt is covered with stencil paintings of the 121 British and Commonwealth aircraft shot down by Luftwaffe pilot Heinz-Wolfgang Schnaufer. It was discovered by a military-air historian in the 1960s, who spotted the unique artifact being used to patch up a roof in the village of Hillegossen, Germany. Scroll down for video Deadly aim: The bullet-ridden section of the Messerschmitt (right) is covered with stencil paintings of the 121 British and Commonwealth aircraft shot down by Luftwaffe pilot Heinz-Wolfgang Schnaufer (left)Luftwaffe pilot Heinz-Wolfgang Schnaufer shot down 121 planes in WW2Marked each 'kill' by printing icon of the target on the tail fin of his jet121 British and Commonwealth aircraft were stenciled over large swastikaHistorian spotted artifact patching up roof in German village in the 1970sThe 'unique' piece of memorabilia will go up for auction in Britain in May 
 Question:Schnaufer was taken prisoner of war by _ forces in May 1945.

British