It was impossible to take Washington with horse archers in that situation. The map was almost as bad as I can imagine, with the 2 warmongers sat behind choke points surrounded by mountains.
I was taking out one American melee unit per turn for several turns, luring them out with workers, and made my assault on T114 and was wiped out quickly by a treb in the city and comp bows whilst struggling through the great wall. The horse archers are a weak defensive unit by T100. I believe it would be an easy win from my final position, either sitting back for the tech advances (and then by conquest or science) or by building a stack of xbows or by changing the victory type.
I dont play civ to win the game, but to win the wargame scenario
Could I have won this? Maybe. I made several mistakes and I wasnt micro managing troop units. I wanted to reduce the size of Hamburg and ended up razing it, as I forgot the Hun's double raze rate
I should prioritize crossbows to back up the final city captures. I should prioritize horse archer attacks for xp to get them all at double shot at range 3. More micromanagement basically, optimizing the strategy.
I will go back to the point where I took out the Aztecs, just to see, I am curious to know. When I have time...