Vernichtungsschlacht
Luchi you are my new hero.
I am almost 100% sure that is the term I was looking for.
Thank you very much.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
http://www.hackworth.com/