Entrenched wisdom

From ‘Armour of offence’, The Spectator, 5 August 1916: The soldier must never forget that it is his business to stand upon the offensive, not upon the defensive, and that for the offensive the power of rapid movement is essential. That is why, as the Germans are finding, and as the Austrians certainly found in Poland, you may make your trenches too defensible, too deep, too narrow, and generally too good. Deeply dug and laboriously protected trenches are splendid if judged only by their power to save people’s lives, so long as there is no in-fighting, but they may become veritable death-traps. In order to drive your enemy back you have got to get out of your trenches very quickly and counter-attack him, or, if need be, fall back a little for that purpose. If you are thirty feet underground you may be very safe from artillery fire, but unable to repel quickly a hand-to-hand assailant.