How to "kill" a player

    Hi, I was wondering what is the best way to properly attack a player. There is a player that is annoying me for a while and he doesnt care if I block or occupy his cities. What can I do to really attack him to demoralize him?

    Na minha Ʃpoca (um sƩculo atrƔs), mantƭnhamos os Portos ocupados ''ad aeternum'' para minar os recursos da criatura.