Well, at least there must be 2 armies, one attacking and the other defending, so select all the units, of one type, on the entire map, I think I would use it 1% of the time
Note: in water maps, I feel the need for more control groups 
Well, at least there must be 2 armies, one attacking and the other defending, so select all the units, of one type, on the entire map, I think I would use it 1% of the time
Note: in water maps, I feel the need for more control groups