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TACTICAL EVOLUTIONS OF THE SUBMARINE 161
Only a part of the boats comprising the flotilla should
take part in the actual assault; the remaining boats to
take up advanced positions in the zones so as to still effec-
tively cover the approaches to the harbor.
After having fired all of her torpedoes, the submarine
should continue the attack by ramming if possible. All
her means of attack having been exhausted, the submarine
must then return under water to her tender for a fresh
supply of tordepoes and to have her batteries recharged.
If she has not a sufficient residuum of current left in her
batteries to make the return trip under water, she may rest
on the bottom until nightfall, when she may come to the
surface and proceed back to her base under her internal
combustion engines and charging her storage batteries
on the way.
Four or five submarines with a total of sixteen or twenty
torpedoes fired as a first load should, when attacking in this
manner, be able to do for six or seven ships at least.
Enough damage would be inflicted to cause the enemy to
turn from his present purpose at any rate.
With the usual four bow tube arrangement and by using
the eighteen inch gyroscopic controlled torpedo, the most
effective system of firing to be pursued would be to fire
two torpedoes straight ahead, and to fire the other two, one
off either bow by adjusting the gyroscope to cause the tor-
pedo to take a course a certain number of degrees from the
straight course pursued, sufficient to compensate for a
probable error in the estimation of the range, speed and
course of the target. Under these conditions it is almost
certain to land one of the torpedoes in its mark.
An error of one knot in estimating the speed of the target
will cause a difference in position of one hundred and one