Some battles call for units to enter play as reserves. These units use the rules for reinforcements (see the). The following additional caveats also apply:
Units that are not normally allowed to move (certain altars or war machines spring to mind) are placed touching the table edge.
Characters can choose to either enter the battle on their own or as part of a unit they are allowed to join. If the battle uses dice to determine when and where reserves enter, state if the character is joining a unit before making any rolls. If so, make a single roll for both.