You should see my game. 4500. The only way would be to hit him with a group of Lords or lore him to the elves and lend a hand. He gets insanely stronger the longer you wait.

Well ♥♥♥♥... guess imma have to visit the noldor

You can hit and retreat. It will take a long time but it worked for me. My troop make up was archers first then calvary. I like to fight on flat land with no trees so i dont get snagged on something wile i charge alone. Also set the match map size to its largest setting.

When the match starts I quickly set up my troops archers first heros and calvery behind. Then I charge alone, you want to draw as many enemy calvary away as possible. Then the enemy foot soldiers should charge your troops getting cut down by arrows. when the enemy gets too close to your troops, retreat. If you loose troops you get negative morale. You actually get positive morale retreating after you kill a lot of enemy troops. If you get knocked out alot just Leave the fight and find a castle or town to rest up then start the fight over again. I was able to take out a 4k army with only 350 troops.

4k? What kind of a mob or kingdom has that size of an army? It is around 3k if you gather all the lords of a realm or if you leave minor faction armies to grow.

I think its new in 3.9.4 Eyegrim starts out with around 800 troops but gains more as time passes. Every now and then i get a message saying something to the like of, Eyegrim has added to his army by raising the dead or something like that.