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 important thing for machine guns to do at this stage is quickly to seize ground from which to bring effective fire to bear across a wide extent of front. Dealing first with the commander of the batteries allotted to the centre, he will consult the O.C. cavalry and arrange with him his plan of action. It is of the first importance to stop the forward movement of the enemy on the direct line of retreat, as this is the easiest line of pursuit and the one upon which the most shaken portion of the troops will be found. The probable course of action for the machine guns here will be to break up into sections and form a line along the nearest feature of ground immediately in rear, from which fire can be brought to sweep the front and check direct pursuit. The more broken the country and the more commanding the ridge or other features, the more effectual will be the check, for at this stage guns will certainly be prominent in the pursuit and shelter from their fire will be very necessary.

The fact that the machine guns are working in pairs on a very wide front should make it exceedingly difficult for artillery to locate them, except singly, and thus it will take them a considerable time to silence more than one or two of the scattered line of guns. Alternative positions and the constant change to a fresh one after opening fire will render the majority of the machine guns capable of remaining in action until closely engaged by the infantry. This