Depends what you mean by win. the game is mostly about collecting guys. You can collect a lot of guys without paying anything. if by win you mean come first in the highest league at least occasionally, no you are not going to do that without spending money, and even if you are prepared to spend a lot of money, to really be competitive, you would have had to start spending a few years ago or wait till the current leaders have stopped playing. My advice is enjoy the game and only spend what you want to.