Anything is possible.
Re the artillery, I'm thinking that the ready supply of ammo was expended during the battle leaving very little for defensive fires should there have bene a counterattack. In that light firing just to create a screen at targets that may, or may not be there or even be a threat seems a little wasteful.
There may well have been the manpower available to conduct a cursory scrounging of the wreckage. I don't believe though that enough would have been recovered quickly enough to resupply the US units in the area.
Given the scenario parameters, it seems likely that the writers considered any PC groups that escaped to have probably come from one of these units . Taking a bit of a leap, it seems probable the horseborne cavalry were effectively wiped out, given that animals aren't an option when equiping beginning characters with transportation.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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