Demon footsteps

I cant figure out how to change the footsteps of units, for example to make a doom guard have the footsteps of Illidan on The Frozen Throne campaign. Could someone help me?

USe the demon footstep doodads to fill the road with them

Create a trigger that plays the death animation for all the demon footsteps at map initialization.

Create Like some regions in the road so when a doomguard enters a region a trigger play the stand animation of every footstep in the region.


Sorry Couldn't find a better way.