The operation, which had convinced Sir Percy Noble of the value of WATU, required various triangular search patterns to be performed at precise sweep speeds and time durations, and was designed to flush out any U-boats sitting within the convoy lanes. That night, Sherwood performed a half-Raspberry, a slightly modified version of the manoeuvre that held a few escorts in place to survey the sea for any signs of U-boats illuminated by the star shells fired into the sky by the participating ships. The ploy worked magnificently. Various U-boats were located, enabling a barrage of depth charges to
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