If a scenario calls upon players to alternate deployment of units, the winner of a roll-off can choose which player will deploy the first unit. Players then take turns, each deploying a single, non-character unit within their deployment zone, saving characters until last.
All of the war machines in your army must be deployed at the same time, but can be placed at different locations within your deployment zone. All of the characters in your army are deployed last, and all at the same time, but can be placed at different locations within your deployment zone.