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 end of Chapter IX. The ten guns unaccounted for were probably mobile, and used for the defence of the harbour and the various landing-places in the neighbourhood of the fortress.

The mobile machine guns of the fortress will be used on the advanced line of defence with the mobile troops, and should be divided into two—those allotted to the outposts and those allotted to the local reserve.[A] Those allotted to the outposts must be placed in carefully selected positions commanding the approaches to the section of the defence to which they have been posted. These positions will usually be in minor works such as redoubts, emplacements, and lunettes, and they will be selected for their good field of fire, particular attention being paid to their command of dead ground in front of other works. Great care and trouble must be taken in concealing the guns and providing them with good cover, not only from rifle fire, but also from artillery. An endeavour should be made to command all wire entanglements along the front with machine guns, and the angles of traverse of each gun should be carefully laid off and marked in white paint or tape, so that they may be used in the dark accurately to sweep their area of ground. Too much stress cannot be laid on the importance of the accurate laying and sighting of machine guns by day for use at night, and it must be remembered that they are the only weapons which are capable of bringing