Defence in DepthIn order to take ground, you must first give it.
'Defence in Depth' is a theory held amongst some historians that Roman defensive military strategy evolved in the 4th century AD from the previous ideology of 'preclusive defence'. Preclusive defence was Rome's method of neutralising incursions by stationing units along its border, as well as in forward outposts, to trap enemy forces that came between them in a pincer movement. However, Roman borders became too vast to defend properly in this manner; limitanei couldn't hope to successfully defend fortifications until comitatenses swept in from outlying regions to neutralise the threat. This led to the development of defence in depth, a technique whereby the enemy army is given some ground over a large area, weakening its supply logistics as it spreads itself too thinly. Then, its weaker positions are attacked by the defending army, with the intention of repelling the enemy back to its original position - outside the boundaries the strategy was intended to defend. Defence in depth was common in late antiquity, when Rome's Western Empire became too ungainly, and among the barbarian kingdoms that succeeded it, in order to maintain their new-found and hard-won frontiers.
Node SetMilitary Tier 9
EffectsRecruitment capacity: +1 (all forces)
Campaign movement range: +10% (faction_to_force_own_unseen)
Attrition: -30% when under siege (all forces)
Siege holdout time: +1 (double for city-ports) (faction_to_general_own)
|Requires Technologies||Military Regionalisation|
|Enables Technologies||Defensive Logistics Language of Comradeship|
|Enables Units Upgrade||
Cost 106 Upgrade To