Elwin is right, a paladin can use the spell "necro call" however it won't help you to heal/resurrect your own troops. The spell only works on already killed stacks and finishes at the end of the battle.
The Paladins however do have a unique ability that allows troops from 1 stack to be replaced at the end of a battle. It scales so that at level 3, it will replace 100% of the losses from any one stack after the battle finishes. So. providing you didn't lose any other troops, then you wouldn't ever lose any of your archers!
