ships without ship being able to see submarine. I submit that
if submarine campaign is to be defeated it must be by offensive
measures. The enemy submarine mission must be destruction
of shipping and avoidance of anti-submarine craft. Enemy
submarines are now using for their final approach an auxiliary
periscope less than two inches in diameter. This information
just acquired. All of the experience in this submarine campaign
to date demonstrates that it would be a seriously dangerous
misapprehension to base our action on the assumption that any
armament on merchantmen is any protection against sub-
marines which are willing to use their torpedoes. The British
have now definitely decided the adoption, to the maximum
practicable extent, convoys from sixteen to twenty ships. This
is an offensive measure against submarines, as the latter will
be subject to the attack of our anti-submarine craft whenever
they come within torpedoing distance of convoyed merchantmen.
Moreover it permits of concentrated attack by our forces
and obliges the enemy to disperse his forces to cover the various
routes of approach.
Concerning Department's reference to a scheme for protection of merchant shipping which will not interfere with present escort duties, I submit that the time element alone prevents utilization of any new anti-submarine invention. The campaign may easily be lost before any such schemes can come into effective operation. The enemy is certainly counting on maximum effort being exerted before long nights and bad weather of autumn, that is, in next three months. Heaviest effort may be anticipated in July and August. I again submit that protection of our coastlines and of Allied shipping must necessarily be carried out in field of enemy activity if it is to be effective. The mission of the Allies must be to force submarines to give battle. Hence no operations in home waters should take precedence over, or be allowed to diminish, the maximum effort we can exert in area in which enemy is operating, and must continue to operate in order to succeed.
SIMS.
