>>96078605
Plus, come to think about it, nothing beats in terms of speed mentioned already Broken Compass. There, the garrison would be probably handled as 5-6 squads, each rated as Critical danger (so 3 on 2-5 scale) plus important NPCs as also Critical, but representing single person. It would be handled by pure theatre of mind, and in style of "True Lies", but it would work out and take... dunno, 10 minutes? Maybe even less. And would be nowhere near as lethal as Hollow Earth Expedition.
But it wouldn't be faster because it has some speed-up mechanics. It would be faster, because you would be handling the whole thing differently, and just grouping NPCs into single HP/attack blocks