Bomber Command raid - 13 April 1940

9 Blenheims on North Sea patrol. Two patrol vessels bombed. No losses.

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Minelaying, Reconnaissance
15 Hampdens on the first R.A.F. minelaying operation of the war. 14 aircraft laid mines in sea lanes off Denmark between German ports and Norway. 1 Hampden lost. 8 Blenheims sent to patrol Wilhelmshaven area abandoned task.