Attrition

Attrition causes armies to take casualties if they move through hostile terrain such as snowy wastes, deep ocean, deserts and swamps. Additionally, corruption and some other factors can cause attrition.

Any attritional effects present in an area on the campaign map can be seen on the tooltip shown when the cursor is held there.

Factions of the race of vampires will suffer attritional casualties when moving through non-vampiric territories, and vice-versa.

Terrain should not be confused with climate.

Attrition tables

Type	Unit damage	Requirements	Description
When besieged	50%	This settlement is suffering attritional losses as it is under siege.	The population of this besieged settlement is dying from malnutrition.
Chaos territory	11%	Armies will suffer losses due to attrition when in areas with high Chaos corruption.	Blighted by the forces of Chaos, the ground has become hard as iron and the howling winds cut like daggers of purest cold.
Chaos Wastes	0.03%	Armies will suffer losses due to attrition when in the Chaos Wastes.	To travel through the Chaos Wastes is to invite madness, for no mortal can comprehend them.
Bankruptcy	20%	Armies that cannot be sustained will suffer attritional losses through desertion.	These troops are deserting because there are no supplies to sustain them. Left unchecked, this will cripple the army.
Horde Infighting	5%	Horde armies positioned in close proximity will begin infighting, and suffer losses due to attrition.	The rivalry between two mighty hordes has reached a tipping point. The warriors have began fighting each other! (Note: Does not affect Beastmen)
Low fightiness	10%	Greenskins armies with low fightiness will suffer losses due to attrition.	Greenskins are belligerent gits. They will fight anyone, especially each other.
Mountain	0.005%	Armies will suffer losses due to attrition whilst crossing mountain passes.	The mountain takes its toll. A wise Lord would find a road or leave this place.
Non-Vampire territory	11%	Vampire Counts armies will suffer losses due to attrition when in territory with low level of Vampiric corruption	The lands of the living offer no sanctuary for the dead. Vanhel’s curse is upon us, make haste through this territory or they will revert to lifeless corpses.
Regionless	20%	Armies will suffer losses due to attrition when they do not control a home region.	With no region to call home, this force is suffering from attrition.
Snow	0.005%	Armies will suffer losses due to attrition when in frozen regions.	The cold makes corpses. A wise Lord would find a road or leave this place.
Swamp	0.005%	Armies will suffer losses due to attrition when in swamp lands.	This mire claims the unwary. A wise Lord would find a road or leave this place.
Vampire territory	11%	Mortal armies will suffer losses due to attrition when in Undead territory or areas with high Vampiric corruption.	Lands under the dominion of a Vampire take on a dread aspect – there is no sustenance here for the living, as their very life essence is leeched from their bodies.