It is not that it is hard to "win the war", it's that they don't know how to do it. For so long the NOE with 25+ of your closest friends, or the general "horde attack" has been their bread and butter. Now with the town changes, and radar changes the is too much of a chance for someone to up and defend. In most cases this destroys an attack and totally discourages the attackers. They mope for a bit then try a base on the other side of the map.
Time to learn some new tactics, and to learn how to execute them