I almost lost in the beginning; military and religious vessels bombarded my city, there having developed 2 factions, both at war with me. Fortunately I had an ally: the blue nation. And more importantly, I had something the people who were capturing all my cities didn't know about: the power of money. With my one military focused city I pumped out the mediocre amount of vehicles it would allow and defended my cities with them, putting the rest of my vehicles into a trade route with the blues. I had so many trade ships my coffers were overflowing, so I continued to hardass the enemy and buy out my ally's cities as he captured them. Eventually I had enough money to win: I nuked every other city into submission. I win.