Board Thread:Tips, Tricks, and Questions/@comment-50.20.50.17-20131106193427/@comment-114.79.12.15-20131107044205

For troop raid,

If you participate on the last act, you will get 1 pieces, even if you just do it once. However you will get the 1 star. Based on the damage done on the last act, that determine your Stars (1 - 2 - 3)

Hope this helps