Before starting deployment, a unit with Scouts can choose to not deploy at the start of the battle. Scouts are set up after all other non-Scout units from both armies have been deployed, and do not count toward determining who finished deploying their army first. They can be set up either in their controlling player's deployment zone as normal, or anywhere on the battlefield more than 12" away from the enemy. If deployed in this second way, Scouts cannot declare a charge in the first turn if their side goes first.
Note that a character may only join a unit deploying with Scouts if they also have the same rule.
If both players' armies contain Scouts, players should roll off. The players then alternate deploying their scouting units one at a time, starting with the player who won the roll-off.