I am early on in the game, turn 13, but have already gotten frustrated with the White Huns. They attacked early, say turn 5, and by turn 10 I had to do something about them. My puppets seem useless to protect themselves or me, so I mortgaged everything to beef up my 3 eastern armies and started chasing. Well, I caught one of the three, but that was becuase they let me. The other two seem able to move farther than me on the campaign map, even though my armies are +10%. Any suggestions on how to put an end to this, other than suing for peace?