you boys must be city slickers!
Hogs raised for meat can grow quite large, similar to a large steer/bull. Pork is also the most common table meat in Europe today, because it requires less feed & space for more kilos of edible products than cattle.
As that depends on the animals’ characteristics, I’m “pretty sure” that was the case 100years ago in Europe. & technically speaking, ALL tanned animal skin is “leather”, whether bovine or ostrich........
I can’t think of many reasons why a Christian based country WOULDN’T use every available resource in wartime, particularly if one of those was relatively plentiful. There are certainly differences in quality & sensible uses of different kinds of leathers that would affect their use for anyparticular purpose, say for slings and pouches, belts & boots.
just my $.02