>>5667740>Ammo and the arms for them Food is a non-issue. This will not be a traditional siege. Horus does not have the time, nor desire for that. He'll want to decisively take Terra, not watch it starve, lest Perturabo and Roboute encircle and destroy him (which is the plan)
Manpower is not bad, but manpower has the problem of morale and food. Many Auxilia swore to the traitors in fear and desperation, or become bloody sacrifices.
The Machine Spirits of the Machine God will defend Terra. They do not break, they do not starve, they need no rest. Only the ammunition to feed them. Let there be a Sentry-Turrets behind every plate of brass, let there Automated-Lascannons and Rapier Laser Batteries and the ammunition to supply them. With the Omnissiah itself on the field, Scrap-Code will not avail the foe.