How to increase "Kingdom Might?"

[Zingo]

I've been playing for just over 20 hours and really enjoy the game, but want to know how to increase my kingdom's strength. My kingdom size is about 8-9 mortals (considered a "Medium" kingdom), primarily equipped with Bronze/Steel. I seem to be well behind in Kingdom Might compared to the rest of the world (with just under 300 overall might) and am curious about what impacts this score? I'd love to be able to partake in the "conquest" update and battle my neighbors, but it seems like we are underequipped. I'm not sure if I'm just behind on tech or if I am not building enough of something. As far as defenses I have a catapult and two ballista. Should I be hiring mercenaries, working to get better armor, getting more mortals? Thanks!

[xobermon]

Kingdom Might is your Kingdom’s Strength plus a percentage of the Strength of your Vassals or Overlord.

Kingdom Strength is number of Mortals, combined Health (so lvl), combined Melee, combined Ranged, and Kingdom Wealth x10 (Coins).

We need to add a tooltip that shows your breakdown, but for now you can see how you stack up relative to other Kingdoms by hovering the Strength portion of their Ruler’s details on the World Screen. Theirs is shown relative to yours.

Hope that helps!