I saw once in an unpopular movie that a sledge hammer was thrown to a... I think its like 5 to 10 inches thick concrete wall. What I know from your past myths was that almost no weapon can destroy a concrete wall. but if you don't beleive the sledge hammer breaking the concrete wall, then why not try other weapons or stuff. Like swords, knives, even bigger stuff to throw at. Just try throwing stuff to break a concrete wall. I really wanted to see it coming. Thank You!!! Carlo Miranda