常量
NAI|AI_TERRAIN_RETREAT_THRESHOLD
AI retreats from battle if CalcArmyTerrainEffectiveness returns below this (1.0 = neutral, 0.80 = 20% penalty)
0.80
AI retreats from battle if CalcArmyTerrainEffectiveness returns below this (1.0 = neutral, 0.80 = 20% penalty)