However, the dwarves (of all people) don't think the human newly elected to the position has what it takes to beat the concerted attacks of chaos. The puppet emperor keeps issuing orders that gets dwarf troops killed.
The dwarves seize control of the human government in order to assure their own survival. They proceed to (very ably) control the empire's armies, turning the tide against the armies of chaos.
The humans and the dwarves end up in a civil war in the midst of all the (literal) chaos.