Biggest blunder of my short career . . . . current game . . . . Monarch, large pangea, 12 Civs . . . I'm the Ottomans. Expansion phase, I send out the warriors to pop the huts and see where to set my boundaries. All the huts gave me warriors. Decent start. But, the last hut defeated all of the warriors and then some, so I ended up with nothing from the huts. OK, no advantages from popping the huts. I'm not worried, I can still trade for techs as I meet the AIs.
Determine I'm on a fairly large penisula, with America to my north. The southern end of the penisula is swamp land, so I'll expand towards America and get the southern part of my penisula later. America is to the north of a mountain range, so I set up my cities on my side of the mountain range. Still about three techs behind, but not too worried. America plants a city, Philadelphia, inside my new borders. Still not concerned, except I figure America will be a problem later.
Decide to see what cities are to my north and where the chokepoint will be. Behold, two tiles away is Washingto D.C.! I've expanded all of the way up to Americas capitol, but the maoutain range will be a great defensive position, so I strengthen up the culture of these border cities so they won't flip to America. While I'm expanding and setting up my northern borders, Germany and America send settlers to the swampy lands inside my penisula, wars are starting to erupt, and my advisors tell me I'm weak militarily and in last place.
I decide to join the crusades against Greece, although I would never send anyone beyond my border and never fought, and focus on settlers to plant as many cities in the swampy lands as possible to keep Germany and America. By now, America is a military power, so I need friends and pay tribute so my expansion will continue. Finally, get all of the penisula settled except two German cities. Of course, Germany and then Persia (top dog) decide to declare war against me. Still not worried, my borders being established and they have have to go through America to reach me. I fend them both off without any losses, get peace and some techs, but I'm still several techs behind. Hey, I'm not in the middle ages, yet, so I feel confident that it won't be long before I catch up in tech.
Remember the war with Greece, the one I'm not fighting but joined in so the AIs wouldn't dogpile against me. Well, Greece gets peace with everyone else except me. I'm counting turns, on the 20th turn I ask for peace and it is granted! Great, now I'm looking for trades and Rome tells me that I was a bad boy and won't trade with me. I've miscounted. It's only been 19 turns!!!!! Nobody will trade with me. I'm stuck with a boring, defensive game.
Furthermore, when the revolution to Republic occurs, it's a seven turn deal, and production stops for another dozen turns. Now, I'm in the dark ages compared to everyone else, America is sending out row upon row of knights, while I only have horses, and I'm stuck on a penisula with no way to get out. I decide to go by sea, fill up 10 galleys with horses, settlers, workers, etc, and every nation kicks me back home. I have no iron, no way to get off of my penisula, no trades, and getting further behind in techs. Of course, it's the perfect situation for the AIs to declare war; first Persia, then China, Greece, America, Germany and I forget who else. They each send in the stacks of knights, archers, spearman, and whatever, and each stack is greated at the borders with my 14 Knights (built before my iron ran out), numerous horsemen, musketmen and my stacks of tribuchets. Each of their stacks are killed off, my wounded are sent home to recover via America not wanting them in their land, and one by one peace is restored.
My only hope for winning is to get to calvary before the AIs get too many calvary, and storm back quickly and make my offensive. I'm so far behind in techs calvary will be my last tech. Patiently I have every city prebuild for calvary, and when I get calvary, presto . . . instant army!
Washington DC . . . . 12 spearmen protect it. Their knights are at war someplace.
Philadelphia . . . . Only four spearman
Atlanta . . . Just two
Miami . . . . Four spearman.
I have 14 knight, 12 calvary, and stacks and stacks of trebuchets. And a load of defensive units to keep whateve cities I conquer. In five more turns, calvary will triple and revenge will be mine.