But..
I have found using searches by subject
"Military art and science", or "Peninsular War, 1807-1814" or "Napoleonic Wars, 1800-1815" ....
dozens & dozens more books I don't recall being posted up before.
Hopfner, translations from Russian on 1812, and misspoolings that would make them impossible to find by title such as the "Compogne de 1812"

Bad news is that adding date filters seems to screen out too many that should be included,& not everything that should be there is there, but this glass looks quite full.

Jeff Lewis