For the purposes of encounter building and rewards, four to six minions count as one standard monster (four at heroic tier, five at paragon tier, and six at epic tier).
         Combined with another role (a minion skirmisher, for instance)
         Has only 1 hit point
         Simple to run
         Almost always appears in a group of others of its kind

Tip: Use four or more minions at a time to create waves of enemies or to build a short-lived wall between the adventurers and other foes.

Published in Rules Compendium, page(s) 288.