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voor de liefhebbers van submarine tactics ;)

Remarks on Submarine Attacks Against Convoys
website capture in pdf

CONTENTS. 
  Page. 
I. Under-water Speed 5 
II. Effect of Bad Weather 6 
III. Surface Speed 7 
IV. Hearing Powers 7 
V. Submarine operating by night 8 
VI. Tactics of Submarine on sighting a Convoy 8 
VII. Tactics of Submarine when attacking 9 
VIII. Tactics of Submarine after an Attack 11 
IX. Effect of Convoy zigzagging 11 
X. Two or more Submarines co-operating 12 
XI. Single Ship Escorts 12 
XII. Convoy Escort 14 
 Diagrams.  

This book is for the use of officers generally, and may in certain cases, be communicated to persons in His Majesty's service below the rank of commissioned officer who may require to be acquainted with its contents in the course of their duties. The officers exercising this power will be held responsible that such information is imparted with due caution and reserve...

Thanks to Rockhound57 :)