When i was in a clan war, sometimes our enemy joined my clan and spy our clan until we realized, this account was our enemy...
My idea, may be coc needs guest mode so account that just already come to clan can't see our member trap until the leader accept the account to be a real member. He can request troops but can't see our base..So there is no spy for clan war. Unless this problem will be strategy for clan war that supercell want it just forget it. :)
Thx..

