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 on a frontier or on the lines of communication to maintain themselves in the midst of the enemy when unsupported by other troops, and also to form a chain of posts across an enemy's country for the capture or suppression of guerilla bands.

Looking back to the South African War, it appears inexplicable that little or no use was made of machine guns to hold the long blockhouse lines which stretched for so many hundreds of miles in every direction during the latter stages of the war. Time after time the Boers succeeded in breaking through this line, even in places where the blockhouses were within effective range of each other and the intervening space guarded by elaborate barbed-wire entanglements. The reason for this is not difficult to discover. Screened by the darkness, the fire of the small garrisons of these blockhouses was neither sufficiently powerful nor accurate to stop the majority of the enemy from breaking through, even though stopped by the entanglements and compelled to use a single gap. The annihilating and concentrated fire of machine guns which had been laid by day to sweep the entanglements should render the forcing of a similar blockhouse impossible in the future. Machine guns in detached blockhouses should be sited as low as is compatible with a good field of fire, and should have long narrow loopholes prepared for them for at least two positions on every face. Constant change of position within