Archers on walls and weird AI

[Variall]

I was defending castle as Dale, Rhun was attacking and i placed my Dale freeland archers on walls but even as they were firing no arrows were released. In the same battle though Bardian archers had no problem at all slauthering Rhun lowlifes.
I had other problem as i was attacked by 2 Rhun armies 1 full stack and the other just a few units, AI was acting totally confused, they constantly reformed, then they lined all units in one line across half of the battlefield, and bigger army didnt came to help when i attacked smaller army. Then i just speed up and wait, but nothing changed they were running around till the time ran out...
Also i noticed uruks halberd arent wielding any weapons when they engage in battle, they are just swinging with bare hands.