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Antisubmarine Tactics [website capture] (ONI, 1918) WWI
nr42

OFFICE OF NAVAL INTELLIGENCE
Washington, October 1, 1918.

By direction of the Office of Naval Operations this discussion of “Anti-Submarine Tactics” is published for the information of the United States Naval Service.

This pamphlet is most confidential and is for the use of commissioned officers only.

ROGER WELLES,
Rear Admiral, U.S. Navy,
Director of Naval Intelligence.




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PLANNING SECTION

MEMORANDUM.

SUBJECT: ANTISUBMARINE TACTICS.

GENERAL SITUATION.
War as at present (July, 1918).

ASSUME.
(1) That the final answer to the submarine will be tactical.
(2) A long war.

REQUIRED.
Estimate of the situation and decisions as to tactical weapons and tactical methods that should be employed in combating submarines. 

MISSION.
To determine the best tactical weapons and tactical methods for combating enemy submarines. 

ENEMY FORCES.
We need to consider the following concerning enemy submarines:
(1) Tactical characteristics. 
 (a) Ability to rest on the bottom for 72 hours.
(b) Ability to remain submerged under way – 
  60 hours at 1 to 2 knots. 
36 hours at 3 knots. 
12 hours at 5 knots. 
3 hours at 7 knots.1
1 1/2 hours at 11 knots. 
 (c) Increasing ability to run nearly silent when submerged.
(d) Surface speed, 10 to 16 knots.
(e) Ability to submerge in 20 to 90 seconds.
(f) When submerged can hear pursuing vessels.
(g) With upper end of periscope showing, hull is too deep for torpedo running at 25 feet, the maximum depth setting.
(h) Torpedo range is limited to 3,000 yards. The most favorable range is about 300 yards. 
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