Yes HARASS is the KEY with DK and FS while your barracks men are rally pointed to your hero so your men would travel to wherever your hero is. So while your wolves chase around the enemies hero and he is weakened, a DK can death coil him to finish him off, if his not already dead. Remember dont use Death coil if you dont have to, you need it in battle situations. Try not to lose a unit, coz with me the first fiend i build 90% of the time will survive till the end of the match. With orc you can do that to.

For undead dont go altar first. If you plan to hero rush. An orc can do it by himslef. Until when the undead player is ready.

Vamp aura with the ghouls frenzy upgraded is good but in early game its no thnx.