Eustis made a major push to update the military's field manuals, which had not changed since the Revolutionary War. After acquiring copies of manuals published in 1791 for use by the armies of the French Republic, Eustis commissioned a translation and lobbied for adoption of new manuals based on French tactics. Although a new manual was ready for use in 1812, it was not well received by the officer corps, and was not used in the war that broke out that year.