Attrition Battles or "Attrition Warfare" is a military process of belligerent attempts to win a war by wearing down the enemy to the point of collapse through continuous losses in personnel and material. The war will usually be won by the side with greater such resources.
The battlefield varies depending on what battlefield is chosen, it can be land, sea, air, etc.. But the most important difference is that this is an area that causes one, multiple or all participating armies to be warn down and their forces weakened.
The effects of Attrition battles varies depending on how conditions of events, environment or individuals effects the military forces, partially or as a whole. Either units will suffer from exhaustion, be tired, they could become sick or hungry, causing their morale to be lowered and would lead to desertion.
This is vital as it would reflect a faction's Cons or weaknesses.