All aircraft returned from last night's raids, the only casualty being an Observer, Lieut. A. COOPER, slightly wounded. He was over eight miles off course when a Jerry light ack-ack battery registered its objections, scoring a direct hit in the Observer's compartment and rudely awakening Mr. Cooper who will have considerable difficulty in seating himself comfortably for some time to come.Circumstantial ReportOp rep No. 173, Sortie Report and Crew Lists Twelve aircraft required for tonight's operations.