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 cover the advance or retirement of their infantry, and then easily catch them up or get into another position. In fact, if the detachment is mounted the value of the guns is more than doubled."

Machine guns with the rear guard will certainly be exposed to artillery fire, and they will seldom have the time or opportunity for making sufficient cover to protect themselves. It will be necessary therefore either to withdraw the gun on coming under artillery fire or to find shelter from it. If good natural cover has been obtained, it will only be necessary to lower the gun flat on the ground behind it, and for the detachment to lie flat close against it, when they will be practically safe. The artillery will cease fire as soon as they find there is nothing to fire at, but the detachment should not move for some time after this, as the guns, having got the range, will be able to inflict considerable damage if the detachment exposes itself.

It is always advisable to keep one or two sections in reserve with a rear guard to be used to protect the flanks or any point where the pursuit threatens to break through in the manner mentioned by General Alderson. These sections should remain with the rear-guard commander and be under his immediate command; they should be in readiness for instant action.

OUTPOSTS

The duties of the outposts are:

(1) To provide protection against surprise.