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 in position may be able to inflict considerable loss, should the pursuing cavalry follow them too closely while retiring.

As soon as it is known that the main body has reached the rallying position and is ready to hold it, the machine guns can be withdrawn. This will not usually be possible in daylight, and as a rule it will take place after dark. The dispositions of the machine guns in the rallying positions will be the same as in the case with infantry in the defence.

REAR GUARDS

The prime necessity for the machine guns with a rear guard of a retreating force is mobility, and without this they will be of little service and become a hindrance rather than a help.

"A rear guard carries out its mission best by compelling the enemy's troops to halt and deploy for attack as frequently and at as great a distance as possible. It can usually effect this by taking up a succession of defensive positions which the enemy must attack in turn. When the enemy's dispositions are nearly complete, the rear guard moves off by successive retirements, each party as it falls back covering the retirement of the next by its fire. This action is repeated on the next favourable ground A rear guard may also effectually check an enemy by attacking his advanced troops as they emerge from a defile or difficult country."[A]