"Mortars lob explosive bundles in an arc at incoming enemies, dealing moderate damage to a medium area. They are most effective against clustered ground troops."
~In-game description of Mortar Turret


Mortar Turrets target ground enemies within range, particularly infantry. They fire explosive bundles at their targets, dealing the most damage to them and also dealing less damage to nearby enemies. Because of this, Mortar Turrets are most effective against close-together groups of infantry.
Star Wars Commander: Turrets