Between World War I and World War II, Palmer wrote thirty-one books, including Our Greatest Battle, based on his World War I experiences. In his books, he provided an analysis of the future impact of weapons and strategies he had seen, and soon after the end of World War I predicted that a second world war was on the horizon. He was awarded an honorary doctorate from Princeton University in 1935.
Palmer also wrote for the North American Newspaper Alliance in World War II, submitting from London and then Paris at least through April 1945.
1914: The Last Shot, novel about a fictional major European war from the point of view of a small set of soldiers and civilians, written before the start of World War I
1916: My Year of the War,[1] Palmer's account of his experiences as a journalist, starting the day World War I was declared
1917: My Second Year of the War,[1] Palmer's account of his second year as a World War I war correspondent
1919: Our Greatest Battle, about the Meuse-Argonne
1921: The Folly of Nations, tracing the causes of wars in general
1933: With My Own Eyes, autobiography
1934: Bliss, Peacemaker; the Life and Letters of General Tasker Howard Bliss, the only biography of the first American 'soldier-statesman" of the 20th century