It is my job as Madigan's "prodigal son" to seed and harvest the lands of pendor. It is why I don't become Noldor's best buddy until the very end (or earlier in case of certain roleplay issues, which do end the game according to inhouse rules ). Whenever I do note stacks with big prisoner trains ( 200 + ) I usually start to work them gently into obliteration, freeing those poor souls and kindly setting them free to family and home.
I am happy to use minor factions at the beginning for loot and renown (recent upgrades also give you the ladies to free and gather honor from small spawns). Eventually I am happy to have the Dead Legion or others to "guard" my first castle (never town, last I need is a plunder festival, gently sponsored by Snakes or Heretics). However, as soon as established and ready for expansion I tend to go after them.
The Noldors I do pay extra attention as they sometimes drag around 100 - 300 prisoner trains with only few men / women left combat ready. Easy prey for Lords which on their part gathering uberstrenght and thus eventually able to put their filthy hands on the army spawns with much bigger amount of prisoners and so on.
In short : There is no friend walking on Pendor's land unless one amends with joining my command, and thus I shall bring death and misery to knights and demons, kings and lords until the end when All is tuned and plays my chords