Playing Spore for the first time. Got to the civilisation stage, I did not know how it worked very well. I wanted to be an economic city. Bought a couple of cities, then this other nation gets all mad because I'm too big and starts attacking. I only had economic vehicles so I couldn't really protect myself. Eventually lost one of the cities and my main city, and had to flee to the other small city I had bought, which was in a different continent than the other two. Thankfully they left me alone there.
So there I was, small city, all my vehicles in the other continent (except boats), even if I deleted them I wouldn't have room to create them again. I just tried to trade with the other nations then, getting money and gifting it to them while they killed each other. I managed to become an ally of all three of the ones remaining. Two of them remained in the end, and while one of them made their final assault on the other and dealt with huge monsters raiding their city, I made my move.
I bought 3 cities in quick succession, made a couple of them military. Started my own little army. I was now big enough to start trading with new cities, and eventually I had so much money all I had to do was wait for the trade bar to go all the way up so I could buy those cities. Never had to use my army.
I guess Spore isn't a great strategy game (I'm not very good at those anyway) but I liked how I went from being near extinction to complete domination in only a few moves, never using the army I built. I guess the game would never really fully annihilate you, so it wasn't much of an achievement in itself.