You're in a heated race for Adam Smiths trading Company.
Suddenly, an Aztec Cavalry attacks one of your cities. Your war elephant wins producing a great leader. Awesome, now you can rush that that wonder!!. Then, another Aztec Cavalry comes in, kills your victorious war elephant, and then...........kills your great leader -- Right when another war elephant was one square away, ready to help defend the city!!
I almost took a sledgehammer to my computer for playing such a cruel joke.