Hi again,
Thanks for replies.
Mojobojo, I needed my units to attack other units, so I couldn't uncheck rotation for turret behavior. Instead, I created another sprite, added turret behavior, and pinned them together.
dop2000, I think I solved the problem. Still, move-to behavior doesn't seem to work properly. Sometimes knights don't choose the nearest target. I don't know why.
Also using family helped a lot. I will be adding different type of units to armies.