Up to one unit with the troop type war machine can be entrenched for each Master Engineer in the army. An entrenched war machine is treated as being in hard cover when shot at and any charging models suffer a -1 To Hit modifier in close combat. An entrenched war machine can be pivoted to fire, but if it moves in any other way, the entrenchment is lost. If the war machine is destroyed, the entrenchment is considered destroyed as well. A war machine can only be entrenched once.