Battalion — Whenever Ordruun Veteran and at least two other creatures attack, Ordruun Veteran gains double strike until end of turn. (It deals both first-strike and regular combat damage.)
4/15/2013 The three attacking creatures don’t have to be attacking the same player or planeswalker.
4/15/2013 Once a battalion ability has triggered, it doesn’t matter how many creatures are still attacking when that ability resolves.
4/15/2013 The effects of battalion abilities vary from card to card. Read each card carefully.