Employment of railways for tactical purposes during the progress of a war, including therein (_a_) movement of troops from one part of the theatre of war to another, whether with a view to effecting big changes of front or otherwise; (_b_) employment of the same Army Corps on different fronts in succession, their transfer being effected in the briefest possible interval of time; (_c_) the rapid bringing up of reinforcements at a critical moment to some position exposed to overpowering attack which might otherwise be lost; (_d_) surprise attacks on the enemy; (_e_) the throwing of great masses of troops on distant points; (_f_) strengthening weak places in the fighting line; (_g_) strengthening threatened forts by means of troops, guns, munitions or supplies; (_h_) relief of invested fortresses, and (_i_) retirement by rail--when circumstances permit--of troops after defeat.

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