I decide to carry out a second depth-charge attack and the ship is just turning when a roar goes up, ‘There she is.’ It was a successful attack, and the U-boat has come to the surface, but the job is not yet finished. Perhaps she will crash-dive and try to escape. We can take no chances. So, ‘Full ahead both engines; prepare to ram.’ The guns need no orders. They have already opened fire and the U-boat is getting seven bells knocked out of her.
On the evening of the 30th of March, just after 1800hrs BST, twelve Halifax aircraft from 76 Squadron took off from Tain to commence the first phase of the attack. Ten Halifax aircraft from 10 Squadron took off from Lossiemouth and twelve from 35 Squadron took off from Kinloss for the second phase of the attack. The aircraft would be flying a total distance of approximately 1,300 miles with a total flight time, including time over target, estimated at being around eight to eight and a half hours.