The Ancient Age
I build two towns within the ring of mountains, and then a ring of towns beyond the mountains, although the Vikings manage to grab one of those positions. The capital runs as a 6 turn settler factory, and inspired to a large degree by the local geography, I use a rather loose town placement. This is something of a novelty to me; when I started GotMs I had just learned to cram towns, and it worked so well that I haven't really tried other styles since.
I research hard towards Republic, but miss the slingshot thanks to Philosophy from a hut. So I go for Literature first, prebuild some libraries, and research on to Republic; the anarchy ends just before I trade my way to the medieval in 750bc.
Les Invasions Barbares
The arrival of the medieval triggers pretty severe uprisings. The long peninsula due south of Russia is a particularly fertile breeding ground; I am trying to settle the jungles to grab luxuries, but it is a painful process, and in the end I leave a town standing empty, soaking up the barbs while I keep my treasury empty. This last endeavour is quite trivial, as my Republican economy is not coping well with the (relatively meagre) number of horses that the core can push out. Research continues as fast as possible along the bottom of the tech tree.
Reaching My Goal
Invention in 270bc, Guns in 90bc, Chemistry in 90ad, Metallurgy in 230ad and Mil Trad in 310ad. That will do me for research this game. The date isn't terrible, but I am a bit disappointed; if I had made the Republic slingshot, surely it would have been earlier. Anyway, I have been at war with Carthage for some time. Mostly it was a cold war, but a Carthaginian party eventually made its way through Holland and took one of my towns, so I upgrade a horse to cossack and send it off to war... it withdraws from the numidian. Meh. The golden age starts with the retry in 340ad.
Conventional War
In 360ad, Holland completes Leonardo, which is an important wonder for me, but I want to attend to the Vikings first, as they are the closest civ to me, slightly obstructing my core area. I dow Ragnar in 390ad, and send in the cossacks. Stray units and low-tech defenders mean I can get quite a lot of blitzing done. The Vikings are destroyed by 440ad, which is reasonable for a war conducted without ROP rape. I will be using that tactic with my next victim, however.
The Crippling Blow
With the Vikings gone I turn my attention to the Dutch in the west. The plan is to knock out their core with a ROP rape, taking Leonardo in the process. A crippling blow to the Dutch, and a move which will allow me to really accelerate production of my disconnect/reconnect army of cossacks. The plan is not well executed. I start in 460ad, and take four towns, including Leonardo, but the Swiss (mostly defending hill towns) are chewing up my cossacks at a frightening rate. The initial attack stalls before I can reach Amsterdam.
The Second Wave
Dutch resistance may be strong, but the next wave of cossacks enabled by Leonardo arrives pretty quickly. By 540ad, I am ready to try a tech trick. I pay everyone for war with Holland, and sell techs as far as Chemistry and Theology. Then I take Eindhoven, only to realise that there is another Dutch town which I had forgotten about. It is behind Portugese borders, and hard for me to reach, so I am left paying some hefty gpt until Portugal finishes off Holland... that's the risk of tech tricking!
Back To Research
For a long time I had a large prebuild going - originally Sun Tzu, but that wonder went to the AI (A Leonardo prebuild similarly got converted to a very expensive market

). I had stopped research on reaching Mil Trad, but taking the Glib from Holland brings me as far as Theology, so I decide to research on to Music so I can put those shields into Bach. The wonder is built for about 800 shields in 590ad. In the meantime I have been able to sell Education for some good gpt that was left over from the Dutch war deal. Henry helpfully puts the finishing touch to my tech trick by killing Will in 560ad.
Spain and Portugal
South of Holland lies Spain; the obvious next stop for the veterans of the Dutch campaign. I rape Bella's ROP in 590ad, knowing that I can't quite manage a one hit kill; their southernmost town is well guarded by rugged terrain. Even so, the Spanish are gone in 600ad. I am also feeding new cossacks northwest into Portugal. As veterans of this campaign cannot easily proceed to the another war, it is not so important to finish it quickly. I rape Henry's ROP in 650ad, but they are not destroyed until 690ad. This war gains me Sun Tzu.
My Final Victims
I am feeding streams of new units southwest to Carthage and southeast to Byzantium. The Byzantines defend only with spears, and I am able to annihilate them in a single turn (700ad). With their numidians, the Carthaginians are tougher. I start the war in 710ad, and finish the job next turn, for a conquest recorded as
730ad. 56% land area scores me 6745 Firaxis points, which translates to a 10k Jason score.
In retrospect, I see that this map was cooked to provided the cossacks with good blitzing opportunities, i.e. there were not enough resources for the AI to have decent defenders. It was good fun, but I'm still not convinced that the cossack is a worthwhile UU in a normal situation.