On two occasions i have had a thrall stop attacking after they ran out of ammo.
First instance an archer fired out all of his arrows and when i gave him more he still followed me and seemed to aggro on the enemies but he stopped attacking.
Second instance i gave a fighter thrall throwing axes and a 1h axe to dual-wield with. Everything worked fine until my thrall threw the last throwing axe in her inventory. After that she stopped attacking. She still aggroed on enemies but she stopped attacking.
Both times this happened i had the thrall on follow and was fighting in Mounds of the dead. I never managed to get them fighting again, i tried giving them other weapons, more ammo but nothing seemed to work. Anyone else experienced this?