Talk:Siege Mode/@comment-10007163-20130529034617/@comment-8706772-20130529035912

I save them up for castles I want to attack (which right now are the high level castles)... I normally only spend money to keep a gap between me and whoever's number 2, but recently I've been spending extra trying to get an extra star.

If you use all your challenges before the day-change - that would give you basically 40 attacks without buying any.