 In the "New York Times" and scholarly journals, he correctly predicted the Franco-Austrian War in 1866 and the Franco-Prussian War of 1870.He made significant contributions to historical journal publications under the pseudonym "Anchor" which extolled the services of Sickles and Buford, and in separate publications praised the men of the New York City Fire Department.De Peyster wrote extensive military histories about the Battle of Saratoga and in 1887 donated a memorial called the Boot Monument, which commemorates Benedict Arnold's heroic wounding at the battle (although Arnold is not mentioned by name and the memorial only depicts his boot).