Army Structure

(WIP - Needs to be updated with latest Force Numbers)
Your martial order and the Hallowed Hounds are both regiments. As to the rest I will explain my current reasoning for force structures. Basically I have defined the standard unit of Force as being about the amount of military ability one trained Apprentice can contribute to the battlefield. Then taking a few rough averages I have worked out the following list.
Apprentice: 1 Warrior: 5 Master: 10 Grandmaster: 50 Monarch: 200 Imperial: 1,300 Venerable: 15,000 Saint: 1,600,000 Immortal: 1.9 Billion God: 200 Trillion
In general the amount of soldiers each officer can keep track of and command starts at 4 for one warrior in a squad, then goes up by 4 for each higher realm. So one master can lead 8 or warriors, one grandmaster can keep track of 12 or so masters and so on. Typical military formations are composed of three formations. The vanguard, main force, and rear guard lead by the second in command, commander, and third in command. With each one leading roughly the same force.
So a regiment will have three masters, 25 or so warriors, and around 120 apprentice soldiers. These numbers are bit different than what I've said before. I was estimating a bit before, and these are the more rigorous values I came up with after running the numbers.
Going by the chart of Force that means a Regiment is about force 275.
A division has three grandmasters, 40 masters, 320 warriors, and about 1200 apprentices. For a force level of 3400 or so.
The Legion mentioned under the Kingdom Baishan is one step up with 3 monarchs, 50 grandmasters, 600 masters, 4800, and almost 20,000 apprentices. For around 52,000 force.
Note that these are theoretical military sizes. Lugong doesn't actually have the grandmasters necessary to lead all of its divisions. And even Baishan doesn't have the grandmasters for both its legion and its divisions. Plus gathering a bunch of grandmasters into one force takes them away from their other duties. So a good commander would know that the Lugong divisions are probably under strength and the Baishan legion is probably a paper tiger.
Typically this holds true in most regions of the World's Edge. It's not that hard to find enough masters to field a regiment. But going higher than that requires places with fairly deep pools of cultivators.
Also this is taking the average cultivator so I don't need to simulate every single soldier. Individual characters can be quite a bit more powerful. For instance Queen Li Mei is much powerful than just a standard 200 force Monarch.