We gain nothing from simple rules like dive to 200m, shoot from 4000+ meters, do this and then that because the enemy (= TDW & TDW's IRAI) can prepare for that easily.
Before any war patrol the commander should know ca. 10 evasive manoeuvres by heart. They cannot be explained here because for one thing is clear: evasive manoeuvres of u-boats against destroyers are confidential things and top secret ;)
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Robert Schmidt, LTJG
U-43
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