London, July 12, Five German aircraft' were leved to have been destroyed, and several others severely damaged in a dawn raid on Boulogne aerodrome, by medium bombers of the Royal Air Force, according to the Air Ministry news service, 'The raiders took ground defences by surprise, dropped their bombs, and got clear away before the ant fireraft batteries could fire, 'The first attackers scored' a num= ber of hits with high explosive bombs along one side of the actor aroma, Ten' minutes ater, 20 enemy air craft standing at the back of some hangars were attacked,
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