Diablo3: Make a Road Block for Monsters

Use this to attack mobs from the safety of your side.

To form the roadblock or a barricade to attack from the other side you need the item Boneweave Hauberk. Drop them in a path across the map and they will not be able to attack you from the other side. Use your ranged attacks and DPS them down.

You can buy Boneweave Hauberk pretty quickly in Act 3 Hell mode shopping NPCs. White ones cost about 300 gold each.