[sigilis]

While they didn't have trains, the Napoleanic wars did feature the first use of canned food to aid in logistical supply of armies. You could argue that the lack of trains (and can openers) probably meant that they jumped the gun on starting giant wars. We Americans fixed that in the Civil War, to great and deadly effect.

[littlestymaar]

Appertization was invented in 1804 but Appert did not sell his technology to the French army before 1810 so it's fair to say that most of the Napoleonic wars were run before canned food was even a thing. Maybe it has seen mainstream use in the Grande Armée in the end of his reign, but it was definitely not a deciding factor in Napoleon's logistics for most of his campaigns.

Without trains, the logistics of canned food isn't much better than the logistics of any bread-based food you give to your soldiers. It doesn't solve the weight problem which is the key problem with preindustrial army logistical issue.