[gerdesj]

My old man used to say: "an army marches on its stomach".

Most people hereabouts will be wittering on about how best to kill people/do stuff with drones and forget that logistics is rather more complicated than killing things.

Fundamentally: people need food, water and shelter. Vehicles need fuel, mechanics and stuff. Killing people and destroying stuff needs ammunition or at least something sharp (and that will need something to keep it sharp).

Then you need to coordinate all this stuff, along with comms and a lot more details that I've not mentioned.

Then you need to persuade your troops to do their medieval best on the opposition and hope it works.