Meanwhile, Monty and JC managed to get their differences sorted out by 1240, ending a 13 turn war. I had really hoped the war would be protracted longer to keep JC busy, and it turns out my fears were not baseless. Since Saladin had already picked up Nationalism, I made a backfilling trade with JC in 1280, which was a good thing, because in 1300 he vassalizes HC and DoWs me!
Fortunately, I had kept a decent garrison (3 janissaries) in my cities bordering JC, and was able to draft a few extras as well without going into severe happiness debt. I quickly wrapped up the war with HC, only to find out he has a small island city to the north!

So there will be no drafting and high unhappiness in the former Incan cities for a while.
In 1310, the first cavalry rolled in, and I made him a medic 3 with a warlord I had in reserve. I figure there would be protracted warfare from now on, and a medic three would be a big boon.
The war in the north was going well, as JC was still 1 to 1.5 techs behind, and he had to wade through a fairly thick wall of culture before arriving at a city. I had put 60 hammers into the Taj with the intention of finishing it with a longshot GE born out of Istanbul. On later thought, this was probably a mistake, as the GE could have rushed a useful national wonder like ironworks or Oxford instead of our marble enhanced Taj. On the other hand, the golden age did help getting some more military up and running. After seeing some of JC's knights, I sent a pair of cavalry out for his iron and horses. Naturally it wasn't very hard to repel JC's invasion with superior tech with minimal losses, and by 1390, the bulk of the southern army had arrived in the North.
With the arrival of the Southern army, the counterattack was set to begin, as detailed in this ridiculous waste-of-time diagram.
Green army is not currently organized yet. It will be the wave of cavalry coming out of the golden age, as well as straggling catapults and janissaries from the rear lines.
As can be seen, JC still has significant offensive forces, including siege. Therefore, advances will be done carefully to prevent leaving battle groups isolated. 2 Healthy Janissaries as well as the severely injured will be left in recently conquered cities until JC's borders are beaten back.
The domestic advisor as of 1400 and a situation with tech runaway Saladin (all the redded techs are monopolies.
Normally I really like to have a tech lead, and would make it a priority to recover the lost ground vis a vis Saladin, but I dont think it is necessary in this game. Saladin is fairly friendly towards us, even more so if we switch to free religion, and hostile to the other heathens. I don't think he will be able to launch before we hit domination limit, and because he is so advanced, the other civs won't have techs to offer him in trade. The problem with Saladin is if he decides to suddenly pull a Caesar and vassalize one of the beaten nations, pulling us into a war with him. There are a variety of ways to minimize that possibility, the first option off the top of my head is to trade Saladin Chem (our last tech we have on him) for a trade embargo with Monty/Toku, and snatch up all of the resource trades that fall in the interim.
A civic change to free religion piggybacking mercantilism might be a good idea as well after the GA ends.
I am embarassed to admit that I was so caught up in warmongering that I let domestic issues kind of fall by the wayside during this round. Therefore, our science rate is rather poor (300 during a GA), our research is disorganized (have about 600 beakers in both steel and constitution), and some of our cities are working plains tiles. This is also partially because this is the first time I've used nationhood before, and I was so captivated by the instant soldiers popping up that I may have used it more than I should, although I was careful not to stack unhappiness.
Again, I think there is a crossroads ahead, which is after the current golden age ends, this wave of cavalry is produced, and a last wave of cavalry/janissaries is whipped drafted followed by civic switch to FR and merc. One path is to try and make up the tech lead a bit. This would entail research going towards Cons -> PP -> Democracy, and riding a wave of free scientists (merc + SoL) augmented by representation spread over our large empire to power research. Of course, the war would still progress at a good pace, as the last round of reserves added to our current army should be enough to take Caesar. If going down this path, would generating Great Artists from Istanbul help at all along the Constitution -> Democracy line?
Another path is to just go all in and finish researching steel, after which research is turned off in favor of money to upgrade our current siege to cannons, and whip/draft extensively to push through our continent ASAP. Both paths have their certain charm, and your input would be, as always, greatly appreciated.
The Save at 1400 AD: