Siege, Hostile units wont attack when moving

Hey, i just started making a siege, only problem is that when the triggers thats ordering the hostile units to move to a certain point kicks in, they wont stop for attacking the hero ur playin :/ they just keep marchin on.. so how can i fix this? i want them to attack the hero whenever they see him.

Thanks in advance sweeties =) <3

Hah, I didnt think it'd be that easy.. thanks m8 + rep