111 Halifaxes from 408, 415, 420, 425, 426, and 432 Squadrons were ordered on an attack of the naval base and airfield at Heligoland. The crews were over the target at between 17,000 and 19,000 feet, releasing 1,163,000 lbs of high explosives. According to reports, the weather was clear and severe damage was caused. 
You can get an idea of the extent of damage caused by comparing these strike photos. The first photo (courtesy of Edgar Conrad "Davey" Davidson) was taken at 12:29, and the second (graciously supplied by Ian from 57 Rescue) at 12:37 on April 18, 1945 over Heligoland.

F/Lt A. Cull RCAF and crew from 408 Squadron, flying Halifax VII NP-776 coded EQ-R, failed to return from this operation.

Sgt E. Sykes RAF
F/O F. Hill RCAF
F/O D. Miller RCAF
P/O C. White RCAF
P/O R. Williams RCAF
P/O H. Wood RCAF

F/O C. Holter from 415 Squadron returned early as the stbd outer was u/s. They landed safely at base on 3 engines.

P/O W. Dunningan RCAF and crew from 420 Squadron, flying Halifax III NP-946 coded PT-L, failed to return from this operation.

Sgt L. Murphy RCAF
F/O D. Neilson RCAF
F/O D. Ross RCAF
F/Sgt G. Montgomery RCAF
F/Sgt R. McDonald RCAF
F/Sgt D. Newman RCAF

F/Sgt G. Bellavance from 425 Squadron returned early as the port outer was u/s. They landed safely at base on 3 engines.
F/O J. Halle was hit by flak, not serious.
F/Sgt J. Beaudoin had the stbd outer u/s outbound. They bombed and returned safely to base on 3 engines.

F/O R. Lemay from 426 Squadron was hit by pieces of an exploding Halifax. There were holes in the aircraft and the port tire was blown. They landed safely at base.

F/O S. Pepler from 432 Squadron was hit by flak, there were holes in the stbd wing and fuselage.
                             

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