Most units are able to 'march', allowing them to move rapidly across the battlefield. A marching unit can double its Movement characteristic. Whilst marching a unit can wheel to change direction, but cannot perform any other manoeuvres. However, a unit that marched in the Movement phase cannot shoot during the Shooting phase (including casting Magic Missile or Magical Vortex spells).
Note that whilst in Marching Column, a Close Order formation may triple its Movement characteristic when Marching.