This is not the right way to go about it. What you need to do is build a city (within your lands...or not, if you're already at war) that will push back the AI's borders just enough for you to get enough Cavalry/Tanks to conquer one border AI city. Once that city falls, you should have access to all the other ones on the same continent via the AI's own rail network.Originally posted by gunkulator
...that don't work in AI land. By the time Tanks come rolling along, much of the AI's territory is 3 squares deep. If you bring Artillery, you need one turn to get 3 squares away, another to get 2 squares away and then you can attack on the third turn. Reinforcements? Forget it. They may be just one square away on clear land but it might as well be across a mountain or swamp.
Of course, it's not always that easy. Here are some things that can ruin your RR-rush:
1. AI places it's cities too far apart; usually it sticks to 4-tile, but sometimes the underlying terrain messes with this. In the worse-case scenario there will be tiles that the AI has not worked at all (Forest, etc.) because they do not fall within any of it's cities' workable radii.
2. AI does not have any or very few Railroads. Here you have to use your own (hopefully massive) Worker force to connect the dots with rails.
3. AI sometimes gets Mech. Inf. too fast. Here even large stacks of Artillery will not help very much...you need Modern Armor to start rushing again.
4. You have insufficient units to kill all the defenders (usually two per city) in the AI's cities. Solution: build more units, fewer improvements!
If these four mitigating factors are not present, you can gut an AI civ in one or two turns. Then all you need to do is double back and contain it's standing army, wherever it may lie. If it starts threatening you, you should be to sign for peace pretty easily after conquering 90% of the AI civ's cities!
What players often forget in this era of the game is that Workers and Settlers are just as important to your offensive army as your Cavalry, Artillery, or Tanks. On a standard-size map I like to have at least 60 Workers dedicated to the war effort, and about 7 Settlers just hanging around. Those Granary-pumps never go out of style!