Respawning dead units, Trigger

How would I trigger that when all units die in one of my regions all of them will respawn in the same region after 1 minute. Try to give me a fast way cause I have to do this 50-60 times.o_O

Thanks

Is this creep-spawning thing?
Like in dota, creeps spawn every 40 sec or so. And they won't spawn if there are creeps in region.
If you mean creep spawn, heres solution:

Events
Time - Every # seconds of game time

Conditions
Number of units in (YourCreepSpawnRegion) Equal to 0

Actions
Unit - Create # Creep for Neutral Hostile at center of (YourCreepSpawnRegion)

(I don't know if this thing below works)
BUT if you wan't it like so, that when all creeps die in region, wait 1 minute and spawn new creeps its here:

Events
Time - Every 1 seconds of game time

Conditions
Number pf units in (YourCreepSpawnRegion) Equal to 0

Actions
Wait - 60 seconds
Create # Creep for neutral hostile at center of (YourCreepSpawnRegion)