I've been playing a C3C Monarch game as the Hittites (explansionist, commercial) with a self-imposed restriction that I cannot build slow military units (other than artillery) or use them offensively. This has effectively limited me to using only the 3-Man Chariot in the Ancient Age and Knights and Cavalry in the Medieval Age. The restriction does not apply to units popped from huts or generated by wonders- though I am not permitted to attack with these units, only defend or use as MP. The world is:
5 Billion Years Old (few mountains)
Arid
Hot
Continents (70% Water)
Sedentary Barbs
I started on a continent with the Vikings on a peninsula to the northwest, the Americans far to the south, and the Spanish to the southwest. I researched the Wheel and popped several techs with which I was able to set myself up as a tech broker. I secured horses ASAP in order to start building my UU, the 30-shield, 2/2/2 3-Man Chariot. For this ruleset it was perfect- a fast attacker that could capture and hold territory better than a Horseman and is available earlier.
I was able to secure three luxuries in the early ancient age, reducing the need for MP; I built up a stack of 3MCs and went on the offensive against the Vikings, eventually destroying them after two ancient and one early medieval war. I currently control the entire northern half of the continent except for a small Spanish enclave, and own the Colossus and Great Lighthouse (thanks, Ragnar!) as well as Sun Tzus and The Crusades. My military looks like this:
I am "average" against the Spanish and "weak" against the Americans, although according to the histograph I am slightly more powerful. They are both polite with RoPs and I have never fought either, but they have nothing to trade; I have access to all four luxuries and they have no cash. America is in Republic; Spain in Monarchy. I am "weak" against the Mongols and "average" against the Germans, but those two are on another continent and can't reach me without Astronomy. I am the tech leader by far on my own continent; I have all first-tier medieval techs + theology and Chivalry and am 8 turns away from Military Tradition; America doesn't even have Engineering yet.
So what's the problem?
Look in the south, next to Atlanta. That's the ONLY source of Saltpeter on the entire continent. I can't possibly trade for it with the Mongols or Germans; neither have Gunpowder yet and in any case they either don't have harbors or aren't in range. If I want Cavalry, I am going to need to somehow push at least 11 tiles south into America, seizing and holding at least three cities on the way and then roading the saltpeter when I get there. All while retaining knight garrisons in strategic locations up north to stop him from landing troops in my unguarded cities. Oh, and I don't have any MGLs and NONE of my knights promoted to Elite during the last war with Ragnar.
Lincoln seems to have 3-4 pikes garrisoned in his cities and random Medieval Infantry and Longbows skulking around everywhere. He doesn't have Chivalry yet, but he has the prerequisites and I'm sure he'll have knights in a few turns. I could probably take Miami two turns into a war; it's only one square across the border, which means my treb stack (defended by Crusaders) could be bombarding it the next turn after DoW and my knights could then swoop in and take it. After that, though, I'm stuck- his cities are spaced so far apart that my knights would immediately get counterattacked by strong units while approaching the next city in line. I can't hope to take out his horses; he has at least two sources. Going for his iron would also be suicidal; it's four spaces south of the border and half of that is through jungle.
So how on earth do I pull this one off? Any suggestions?
5 Billion Years Old (few mountains)
Arid
Hot
Continents (70% Water)
Sedentary Barbs
I started on a continent with the Vikings on a peninsula to the northwest, the Americans far to the south, and the Spanish to the southwest. I researched the Wheel and popped several techs with which I was able to set myself up as a tech broker. I secured horses ASAP in order to start building my UU, the 30-shield, 2/2/2 3-Man Chariot. For this ruleset it was perfect- a fast attacker that could capture and hold territory better than a Horseman and is available earlier.
I was able to secure three luxuries in the early ancient age, reducing the need for MP; I built up a stack of 3MCs and went on the offensive against the Vikings, eventually destroying them after two ancient and one early medieval war. I currently control the entire northern half of the continent except for a small Spanish enclave, and own the Colossus and Great Lighthouse (thanks, Ragnar!) as well as Sun Tzus and The Crusades. My military looks like this:

I am "average" against the Spanish and "weak" against the Americans, although according to the histograph I am slightly more powerful. They are both polite with RoPs and I have never fought either, but they have nothing to trade; I have access to all four luxuries and they have no cash. America is in Republic; Spain in Monarchy. I am "weak" against the Mongols and "average" against the Germans, but those two are on another continent and can't reach me without Astronomy. I am the tech leader by far on my own continent; I have all first-tier medieval techs + theology and Chivalry and am 8 turns away from Military Tradition; America doesn't even have Engineering yet.
So what's the problem?

Look in the south, next to Atlanta. That's the ONLY source of Saltpeter on the entire continent. I can't possibly trade for it with the Mongols or Germans; neither have Gunpowder yet and in any case they either don't have harbors or aren't in range. If I want Cavalry, I am going to need to somehow push at least 11 tiles south into America, seizing and holding at least three cities on the way and then roading the saltpeter when I get there. All while retaining knight garrisons in strategic locations up north to stop him from landing troops in my unguarded cities. Oh, and I don't have any MGLs and NONE of my knights promoted to Elite during the last war with Ragnar.
Lincoln seems to have 3-4 pikes garrisoned in his cities and random Medieval Infantry and Longbows skulking around everywhere. He doesn't have Chivalry yet, but he has the prerequisites and I'm sure he'll have knights in a few turns. I could probably take Miami two turns into a war; it's only one square across the border, which means my treb stack (defended by Crusaders) could be bombarding it the next turn after DoW and my knights could then swoop in and take it. After that, though, I'm stuck- his cities are spaced so far apart that my knights would immediately get counterattacked by strong units while approaching the next city in line. I can't hope to take out his horses; he has at least two sources. Going for his iron would also be suicidal; it's four spaces south of the border and half of that is through jungle.
So how on earth do I pull this one off? Any suggestions?