Artillery and Battle Groups
If none of a battle group’s Command Groups are deployed in the table, it’s artillery is kept in reserve. The artillery may not be given smoke or fire missions until one of its Command Groups is present on the table.
Artillery and Forward Observers
Units from the artillery’s battle group may spot for it normally. A unit from another battle group can act as spotter if an additional Staff Order is paid when the mission is called. A Single Fire Mission would cost two Staff Orders; a Continuous Fire Mission would cost three Staff Orders.
When adjusting artillery fire, it costs two Staff Orders, instead of one, if the unit acting as Forward Observer is from another battle group.