Campaign Creations

Because you gotta learn how to do variables, Make a certain variable name it and then you set it to (last created unit) right after the trigger. You usually with my knowledge have to create each unit one by one and not just create 12 all to goether. Unless I believe a part of the trigger where it is move all units in the position of the region owned by a player that I cannot remember.

Or use unit groups instead like a rational person who uses critical thinking.