Actions independent or partially dependent on the player | Sauron's Army (Nemesis System) Middle-earth: SoM Guide

The members of the army may attack each other or perform different actions that result from their initiative

The game world evolves, not only as a result of the decisions taken by you, or the actions performed by you, but also independently of your actions. This usually happens when your character dies and some time elapses before you respawn, or when you decide to progress time, by interacting with a forge tower. All of the actions of this type are random and they may result, e.g. in the orcs' fighting for domination, or in the elimination of a Captain by one of the lower rank orc. This may result in the shifting of the power factor in an orc, or in the removing of one of the members of the Sauron's Army, as a result of his death.

It is sometimes possible to join the battles between orcs, but you can skip it

Actions that are partially dependent on your actions include the so called Power Struggles. Also they are started by the members of the Sauron's Army, but the main difference here is that you can decide whether you want to join in, or you want no part in it. In the case of the former, you may need to reach one of the red points on time and start the optional mission. Also missions of this type are random in their course and they may, e.g. concern the feast organized by one of the Captains, or beast hunting organized by orcs.