Prince Julian is generally responsible for patrolling the land approaches to Amber, especially through the Arden, while Princes Caine and Gérard initially shared responsibility for the fleets protecting Amber's seas. Since Amber "casts Shadow but is not of it," walking in Shadow was not possible in the immediate environs of the City or Kolvir. It was necessary to gain some distance from these locations in order to walk in Shadow, traveling to or from other worlds. This usually meant traveling by sea, or through the Forest of Arden. This is why the sea patrols and Julian's force in Arden were effective.