Lancer in Busan is not allowed to attack Korean artillery in tile southwest of Busan. Unit has not moved yet, had no combat this turn, and is stacked with no other "ground units". There are 2 bombers and 1 frigate in Busan with the Lancer, and Lancer can move to any tile except tile occupied by Korean artillery.
Why can't this Lancer attack the artillery?
Why can't this Lancer attack the artillery?