Civilization III: Conquests Hints, Tips

Right of Passage Abuse

Make an agreement of Right of Passage, move your units to their main cities and attack them all at once.

Free Palace Jump

When disbanding your capitol your palace will appear in the biggest other city. Your former capitol can be rebuilt by the settler it created. This way you've moved you capitol for free.

Island block

If you fill the coast of a certain island with units, even non-military, the AI won't be able to land, thus isn't able to conquer that island, until it has marines.

Ship hopping

While at sea, you can unload a ship on the same square where there is another ship and that ship can take over the load. This way you can move your units to any location in one turn. But it takes a lot of effort.

High-efficiency Worker Governments

When starting the game, you are in the Government Despotism. Your workers are so slow that it is annoying. Quickly research the lowest two branches of the tree in Ancient World to get the Monarchy Government. Your worker speed doubles, and you can Hurry anything except a Small or Great Wonder by spending gold, not population. Play normally until you can get the Democracy Government in the Middle Ages era. Worker speed goes up 1.5 times. What used to take you six rounds now only requires four. After that, play normally until you get to the Modern World. There is no reason to choose Communism, except for Police Stations (which you do not need to be Communist to build). This means you can actually not research Communism. Instead, choose Fascism Government. It speeds your workers up again. What takes three rounds in Democracy only takes two in Fascism. This is the fastest that you can get. The speed ratings are as follows:

Despotism: 50%
Monarchy: 100%
Democracy: 150%
Fascism: 200%!
Most of the others are 100% speed. Also, Monarchy is the easiest to get.