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 Where the tactical reconnaissance has already been completed and the principal object is to protect the force covered, machine guns will be found most valuable to support the flanks should an attempt be made to turn them, as their mobility enables them to be sent to a distant point with great rapidity, and their concentrated fire at once makes itself felt at a threatened point and turns the scale in a fire fight with astonishing suddenness. This mobility renders them particularly suitable for seizing and holding positions until the main body comes up.

When used for this duty the battery or section commander, as the case may be, should receive definite orders as to the importance of the position he is sent to hold and how long he is expected to remain there. The position should be carefully reconnoitred by scouts before the guns approach it, and steps should be taken at once to entrench the guns and teams against artillery fire if the position is to be held for any time. Alternative positions for each gun, with concealed approaches, should be constructed, and the guns carefully hidden by erecting screens in front of them, or by placing them behind bushes, which are then cut almost through the stem, so that they can be instantly removed to open fire. Ranges must be taken and carefully written down, with their compass bearings to conspicuous marks. The flanks must be protected, and dead ground made good by posting one gun to sweep it. The gun horses and