Well, I finally reached the magic number (actually got to about 150,000 thanks to splatting a StreetPass monarch with a smaller army), took on the final empire... and won on the first attempt at those odds. Go me!
This reminds me of my first attempt at the treasure chest minigame in Minish Cap, where I got all the way to the end first try. I've never managed to repeat that feat.
Congratulations, my liege! I always believed you could do it!Wentworth, StreetPass Battle