Units can be arranged into various formations, which give them different bonuses suited to various combat situations. The formations available to a unit are displayed on the Battle Army Panel, with the current formation highlighted. Clicking these buttons will cause the unit to change to that formation, which usually takes some time. Note that units that are already in melee cannot change their formation. Each formation has its benefits and drawbacks. Common formations are the Horde and Closed Array. Horde is effective against Archers; Closed Array is more preferable in melee. Certain units have their own unique formations that grant extra advantages (see the pop-up panel at each formation for further details).