I was too interested in my own game. Not long after the Carthaginian encounter, a German horseman approaches an undefended city at my south frontier. And in the west, my warrior encounters the Russians. Both are humans, and both want a trade right away. But it is no use.
Nobody is willing to give up an advantage.
We conclude negotiations and return to our respective cities. My little empire continues to grow - I am now at five cities on the easter coast of a large continent. My capital, Babylon, is now producing the Hanging Gardens, which will ensure future happiness among my people. I am at peace with my neighbours. I click 'OK' and Civilization II disappears from my desktop.