They can literally drown enemys in troops.

Midgard has a population of 115,000,000,000
The military numbers around 2,750,000,000
That are 2.4% of their population or 75% of Avernus population or 40 times our military.
Strength in numbers truely.
@durin 1. Have the nine world pooled all of their transport capacity together and filled everything that was not used by then with Iron guard regiments? I ask because the three armys (without Iron Guard) only barely number together more than the Iron Guard.
2. To deploy the tue 'We have reserves'-strategy we will need more troop transports. How many more do we need between the nine worlds to deploy 100,000 regiments? Simple math (100,000 / 200 = 500 ) gives an answer but what is the difference that we still need?
3. And how many escort/cruiser would be needed to guard the transporter into an hostile system?
4a. What is the expected population Avernus can handle self sufficient if we do not expand to the other continents?
4b. What is the expected population Avernus can handle if we import 50% of the needed food?