When I want a Field Marshall to attack in a specific area only, I draw plan as bellow...

However as the units advance the arrow has a tendency to move outside the designated area causing all the units on the front line to attack.

(I moved arrow manually in this photo in order to save time and demonstrate issue)
Is there a way to prevent this?
However as the units advance the arrow has a tendency to move outside the designated area causing all the units on the front line to attack.
(I moved arrow manually in this photo in order to save time and demonstrate issue)
Is there a way to prevent this?