Well our army during the invasion peaked at 70,000 - and that was everything we could feasibly muster before going all Russian and sending in waves after waves of civilians.

I reckon Uthein's about 2 million, with a million being situated in and around each of the mining and smelting towns. So like, 7 million Dwarves? I couldn't guestimate the Kobolds, but they're a randy lot... maybe nearer 10 million? I'll have to converse with Neo.