During the combat phase, the attacking player may bombard defending units with his artillery.
To start a bombardment, select the icon below in the top left of the screen:

All available defending units that can be bombarded will be displayed:

To be an eligible target, a defending unit must be within 5 hexes of line of sight of an attacker
- within 5 hexes line of sight of an attacker
- within range of an eligible attacking Artillery unit
- An eligible artillery unit is one that is available to attack and has a unit from its division/Corps with line of sight to the defender.
Select the unit you want to bombard:

Artillery units available to bombard will be highlighted. Select them to bombard with. A maximum of 3 attack factors can be used to bombard with.
You cannot destroy a unit using bombardment, but you can cause them to retreat and thus make them unavailable to the defending side in the next turn.
