Trying to get some Honorbound pieces from rares or Warfronts. How can I get them?

Hey guys. I’m trying to get the Honorbound Centurion’s Greathelm, the Honorbound Centurion’s Shoulderplates and the Honorbound Centurion’s Long Cloak (the longer one) and am having trouble understanding what to do to get them. I read they drop from Arathi Highlands rares but I only get one armor piece a day or from Warfronts and related content but can’t figure out how to start them. Thank you guys for your help.

warfronts require a group to queue in and its just crossing your fingers and getting lucky. if you want the best chance i’d say send in the alt army