Encirclement

Use this Stratagem during the Declare Reserves
and Transports step of your mission. Select one
White Scars unit (excludingArtillery and
Buildings) from your army. You can set up that
unit in outflank instead of setting it up on the
battlefield. If you do, at the end of one of your
Movement phases you can set up that unit wholly
within 6" of any battlefield edge and more than 9"
away from any enemy models.