Tanks don't even attack their tanks, "movement is priority" is a stupid excuse. Own tanks being able to be shot at but not attacking back because they need to move to some location you didn't even select, horrible.
I think movement must have priority. Else you couldn't escape if you are under attack.
If you give two tanks the same destination, one of them will have problems to execute your command. The tank can't reach the desired destination because the destination is occupied. So it try to reach the destinatin as near as possible.
But you can click on the tank, so it will stop (and attack enemies).
Another thing to remark (as in description). In every level the enemies becomes stronger. So they will have a greater range to fire. If you don't upgrade your vehicles, the same type of enemy vehicle will have a greater range as you.
 "AntiVillain (-OneShot-)"){kind=icon}
 "Epic War VI"){kind=icon}
 "Desert Tank Commander"){kind=icon}
Okay will check it Rox