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required, the features being intensity, control, and concentration, all of which are characteristic of machine guns. When required to cover the advance of infantry, machine guns should be used in batteries and must be so placed that they are able to see the infantry they are covering, and to sweep those portions of the enemy's position from which fire can be brought to bear on the advancing troops. If the enemy's artillery is not silenced or at least dominated by that of the attackers, it will be necessary to conceal the machine guns from view and provide cover from fire. That machine guns well concealed and provided with cover (pits) are able to remain in action under artillery fire for considerable periods, is proved by instances in the Russo-Japanese War (see Chapter III. p. 28). Major Kuhn, who was with the Japanese Army in Manchuria, in his report states: "Importance is laid on concealing the guns, and it was claimed that none had been knocked out by the Russian artillery." Covering fire from the flanks is more likely to be effective than frontal fire, because it will enfilade entrenchments, reach men behind natural cover and have a more disconcerting moral effect than frontal fire. It will not always be possible to find suitable fire positions on the flanks for machine guns at this stage of the attack, and it will then be necessary to place them in rear of the attacking infantry and fire over their heads. This can be done with perfect safety—indeed, there is far less danger of accidentally hitting the