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 them limbered up, i.e. when changing position or while coming into or going out of action, for then they are most vulnerable. The situation at the moment of the flank attack is this: The front of the position is attacked by a strong but widely extended firing line which overlaps the flanks and compels a strong defensive firing line to check its advance. If the defender decides to put his machine guns into position here and to reserve half the squadron for defence of the flanks, the great extension of the attack renders their fire of little effect as long as the attack utilises cover and advances by rushes from the right or left of sections; on the other hand, if he decides to put the squadron into the firing line and to use his machine guns to protect his flanks, he has either to divide his guns or wait till he can see which flank is threatened, and he cannot ignore the troop which is moving against one. Consequently, he must either be weaker than the flank attack—in which case it is likely to succeed; or he must withdraw troops from his position to strengthen the threatened flank—in which case there should be no difficulty in pushing home the front attack with the aid of the extra troop; while the position of the machine guns on the flank and rear should render his retirement from the position very costly. In all probability the threat of turning a flank either by mounted troops or by machine guns will compel the enemy to abandon the position in the case of a minor engagement