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http://www.hnsa.org/doc/attack/index.htm

Submarine Torpedo Fire Control Manual 1952

this is post war but considered by the author to be the distillation of wisdom gained in the course of ww2

Quote:

Our submarines during and since the last war have demonstrated their ability to accomplish a variety of special missions of which they had previously been considered incapable. Many of them have been so altered that the accomplishment of these missions have become their primary duties. The primary mission of the true submarine, however, remains, today as it has always been, the delivery of successful torpedo attacks against the ships of an enemy.
The types of targets which a submarine may encounter are many and varied, i.e., single unescorted merchantmen, single destroyers, submerged submarines, unescorted group of ships, convoys, and task forces. The variety of targets and other unpredictable conditions, such as weather and depth of water, render it impracticable to set forth a procedure or doctrine which will apply under all conditions. The submarine Commanding Officer must rely mainly on his own judgement and experience to insure the completion of a successful attack.
There do exist, however, tested and proved procedures and tactics which if followed will assist the submarine Commanding Officer and increase his chances of success. It is the purpose of this book to present to the officers of the Submarine Force under one cover the best known principles of Submarine Fire Control Organization and Torpedo Attack Tactics.