[Adm.Lee]

I think, before the conversion of entire divisions to horsed cavalry, you should see horses being used at the sub-unit level.

First, as a messenger service when a unit is in a relatively static mode, like in cantonment. Why burn off alcohol that you'll need in a real battle just for delivering mail and messages?

Second, spinning off that, you might see officers on inspections or going to conferences using horses, to save wear and tear on vehicles and, again, fuel.

Third, horse scouts for battalion scout platoons or similar units, again mostly when the unit is static, and expanding to when the unit is on the march. If most of the army is no longer capable of carrying its troops and baggage in motor vehicles, then the infantry is walking, and the whole army is reduced to that same pace. The speed of horses is no longer a liability, and is valuable for scouting again.