Various nations begin competing for the land I've opened up in my last couple of campaigns. A Persian city appears out of the blue up north (i.e. the northern tip of former Zulu territory); three more Persian settlers appear in the area; then an Ottoman settler unpacks his bags right next to my blockade, pulling the old "build a city right next to player's troops so he has to back up a square" maneuver, in the central mountains.
I wipe out that city without even bothering to declare war on the Ottomans. One of the nice things about having a bad rep is, you have nothing else to lose if you backstab someone again. My troops scout around a bit; I spotted a stack of five Ottoman units last turn, and I know they're still around somewhere. They are located a couple tiles northeast. I kill two with cavalry, then send in my Army to kill the other three.
Computer's turn. I receive a very GENUINE surprise. The AI launches a
direct attack against my Army!
My Army still has 8 hit points after its attacks last turn--but the Ottomans attack it with four MI's in quick succession. My Army kills three of them. During the fighting, I learn that units inside an Army CAN promote.

The fourth MI red-lines my Army, and it very sensibly retreats. Go patch yourselves up, boys, you've done plenty of damage today.
I can still do damage elsewhere, however. Since I'm in a rowdy mood, let's declare war on Persia and get rid of some of these settlers. Persia doesn't take it lying down; one troublesome Immortal in the mountains red-lines my first cavalry--and kills the second! Third times the charmer, and I finally get rid of that Immy. Then I destroy the city of Antioch--that 3 moves per turn is very handy--and, a turn later, I destroy that other Persian city that appeared "up north".
Entremont turns out to be a great city to have. It has a barracks, and it's an ideal base from which to launch hit-and-run attacks on Persian units moving towards the battle front (and my force at Entremont inflicts fearsome casualties on the Persians in later turns). I kill a couple of defenders at York, and start moving up some Musketmen to support my offense.
Over the next couple of turns, Persia counterattacks with LOTS of troops, mostly Immortals, and I start taking losses.
Each turn, my Mounties find oodles of targets to snack on, and they snack heartily. My production centers churn out new troops just as fast as I lose them in battle. Then, in
1590, Persia uses the roads two tiles north of Entremont to sneak-attack the workers I had trying to build a road through the jungles. The tile has a Musketman and a Cavalry on it, but I lose both. Then I lose the workers; Persia disbands them all.
Then things get nastier: a Roman settler founds the city of Ravenna--smack in the middle of the roads I've been using to attack Persian units. I have a Cavalry right next to Ravenna, and Rome does the old "get out of my territory or declare war" deal. Okay, okay, fine--I'm leaving already.
Then things get nastier still--an Ottoman settler appears north of Ravenna!

DAMMIT, these Settler attacks are driving me CRAZY.
Bah, who am I kidding--Settlers drive me crazy every game I play.
The good news is, I then enter the Industrial Age. My research is rippin'; I only need 8 turns to finish Steam Power (naturally, I'm going straight for Replaceable Parts again).
1600 AD: Egypt loses Heliopolis again.
My turn. I lose my temper and set off yet another war with a sneak attack against the Romans. The pic below shows why I love units with 3 moves a turn:
The currently-selected Mountie moves east, through Marathon and over the mountain pass, bypasses the jungles, and whacks Ravenna all in a single move. The destruction of Ravenna returns the tile directly north of it to international status, allowing me to get a couple more Mounties through that tile to destroy that second Roman city (just off the top right corner of the previous screenshot) the same turn.
Computer's turn. Rome moves a few units around, but does nothing in the way of direct retaliation. I lose another Cav or two to Persian counterattack.
My next turn begins with my Army parked opposite York; the city has only one defending Pike. He dies, the city follows. I commit some more random destruction on Persian and Roman units in the area.
1615 AD
Seven civs to go. And I'm at war against three of them. Two of them being the biggest opponents I have in the whole game. I've definitely bitten off more than I can chew this time, and frankly I intend to chew it up and spit it out.
Come get some, I got plenty for everybody!!!