(4) Houses should be loopholed and windows sand-bagged, while house-to-house communication must be improvised to increase the defenders' power of manoeuvre. (5) The interior of the village should be defended by the cross fire of machine guns and Lewis guns, but while churches and halls, and the inner edge of village greens and of squares, should be prepared for determined resistance, such places should not be occupied as billets, owing to the risk of loss from artillery bombardment. (6) The natural difficulties of maintaining control in village fighting require to be counteracted by increased effort and vigilance on the part of all leaders, and special arrangements must be made for collecting information in report centres, the position of which must be made known to all ranks in the defending force. {164} CHARACTERISTICS OF THE VARIOUS ARMS "The full power of an army can be exerted only when all its parts act in close combination, and this is not possible unless the members of each arm understand the characteristics of the other arms. Each has its special characteristics and functions, and is dependent on the co-operation of the others" ("Field Service Regulations," vol. ii. (1921)). "An intelligent understanding of 'the other man's job' is the first essential of successful co-operation."--MARSHAL HAIG. INFANTRY "Infantry is the arm which in the end wins battles" ("Field Service Regulations," vol. ii. (1921)). The speed with which infantry can advance, and the distance which can be covered in one day, are the only limits to the striking power of well-trained infantry. In the Great War these limits were largely removed by the use of Mechanical Transport, and this means of transportation will be used increasingly in Modern Warfare, in order to bring fresh troops into or near the scene of action, or to expedite the removal of exhausted troops from the battlefield. Against these natural limits to mobility are the compensating advantages of the power of infantry to move into and over almost any ground by day or by night, and the rapidity with which trained infantrymen can find or improvise cover. The main object of battle is to close with the enemy and to destroy him by killing or capture, and it is this power to close with the enemy which makes infantry the decisive arm in battle. THE RIFLE AND BAYONET.--The rifle is the principal infantry weapon, and the British "Short-magazine {165} Lee-Enfield" rifle is the best rifle in action. A trained rifleman can fire 15 aimed shots in a minute, reloading with the butt in the shoulder and eyes on the mark. With the bayonet affixed the rifle is the principal weapon of close combat for delivering or repelling an assault, and in Night Assaults infantry depend entirely upon the bayonet.