Every so often, when playing longer games with units garrisoned in cities, I experience friendly fire. Units that are traveling along roads or railroads end up intersecting with friendly units along their path that are garrisoned in cities. This starts a little battle between friendly units that can really play havoc with worker units set on auto mode.
This may be seen when playing the world map and placing a city near the upper area of South America in such a way that paths from North America to South America have go through that city. BTW, when you play the world map and you happen to start in Central America, you can get a free city by heading immediately southward towards South America. It is THAT city which will cause this problem. I've had this problem on other maps as well.
This may be seen when playing the world map and placing a city near the upper area of South America in such a way that paths from North America to South America have go through that city. BTW, when you play the world map and you happen to start in Central America, you can get a free city by heading immediately southward towards South America. It is THAT city which will cause this problem. I've had this problem on other maps as well.