Vegetarian diets were easier to transport, so it could be a primarily logistical issue. An Army moves on its stomach. Much of Napoleons speed over land was due

Vegetarian diets were easier to transport, so it could be a primarily logistical issue. An Army moves on its stomach. Much of Napoleons speed over land was due to how quickly and stably they could move food due to canning. https://www.npr.org/sections/money/2012/03/01/147751097/why-napoleon-offered-a-prize-for-inventing-canned-food https://www.npr.org/sections/money/2012/03/01/147751097/why-...