Fear God and Take Your Own Part (1916), by Theodore Roosevelt

Fear God and Take Your Own Part was a followup to Theodore Roosevelt's 1915 book, America and the World War.  That earlier book was a collection of writings by Roosevelt in late 1914, after war had broken out in Europe.

In Fear God and Take Your Own Part, Roosevelt wrote about the response of the United States to German aggression during the war, in particular the sinking of the Lusitania in 1915, which caused the deaths of many United States citizens. 

Now It Can Be Told (1920), by Philip Gibbs

By 1920, the postwar period after World War I was well under way.  The Armistice and the Treaty of Versailles had been signed.  Throughout a much-changed world, people looked to the future with a mixture of hope and dread.

It was also a time of serious reflection about the physical and emotional destruction of the European war that had lasted for more than four years.

For noted British war correspondent Philip Gibbs (1877-1962), that reflection took the form of a 558-page book titled Now It Can Be Told.

Gallipoli (1916), by John Masefield

The British-led effort in 1915 to take the Gallipoli peninsula in Turkey and take control of the Dardanelles waterway is one of the most debated and discussed campaigns of World War I.

An early contributor to this discussion was the famous British writer John Masefield, who took a break from his usual work as poet, playwright, and novelist to write the 1916 book Gallipoli.

My Four Years in Germany (1917), by James W. Gerard

American public opinion was generally against Germany from almost the beginning of World War I, but that didn't prevent the United States from having a diplomatic presence in Germany for the first 2 1/2 years of the war. This time period is described in My Four Years in Germany, by the American ambassador to Germany at the time, James W. Gerard (1867-1951).

First Lessons in Spoken French for Men in Military Service (1917), by Ernest H. Wilkins and others

The training of American soldiers and other military personnel involved more than how to shoot a gun or work in a team. It also involved learning the language of the country where they would most likely be working—France.

Balfour, Viviani and Joffre (1917), by Francis W. Halsey

Soon after the United States entered World War I in April 1917, it was visited by diplomats from its war allies. These visits solidified the combined efforts of the allies through private meetings, speeches, parades, and ceremonial visits to historical sites.

Over the Top (1917), by Arthur Guy Empey

When American soldiers began their training after the United States entered World War I in 1917, many of them probably had a copy of the book Over the Top: By an American Soldier Who Went.

The Battle of the Somme (1917), by John Buchan

One of the most significant battles of World War I was thoroughly documented in book form by a famous novelist just months after the battle ended. The Battle of the Somme was written by John Buchan (1875-1940), a Scottish novelist who was well-known for the books The Thirty-Nine Steps and Greenmantle.

Why We Are At War (1917), by Woodrow Wilson

The official reasons for the entry of the United States into World War I on April 6, 1917 are stated in Why We Are At War, by U.S. President Woodrow Wilson.

Our Part in the Great War (1917), by Arthur Gleason

When the United States entered World War I on April 6, 1917, a recently published book helped Americans understand why they were fighting. It also described the significant contributions already made to the war effort by other Americans.

Flying for France (1917), by James R. McConnell

Before the United States entered World War I on April 6, 1917, many American citizens felt individually compelled to participate in the war. A prominent group of such Americans was the Lafayette Escadrille, who enlisted in the French military as fighter pilots.

Italy, France and Britain at War (1917), by H.G. Wells

By the time World War I started, British writer H.G. Wells (1866-1946) had made an international name for himself with speculative fiction like The Time Machine (1895) and social fiction like Kipps (1905).

During the war, Wells wrote much fiction and nonfiction about the conflict, including a 1917 book that was published in the United States under the title Italy, France, and Britain at War. As the title indicates, the book is a history of the war, focusing on Wells's observations of the Western and Italian Fronts after he had toured them in 1916.

Hurrah and Hallelujah (1917), by J.P. Bang

In the search for the causes of World War I, German society was often analyzed. Hurrah and Hallelujah: The Teaching of Germany's Poets, Prophets, Professors, and Preachers continued the discussion of German culture that earlier included the book The German Soul In Its Attitude Toward Ethics and Christianity, the State and War (1916), by Friedrich von Hügel.

The War and Humanity (1916), by James M. Beck

The War and Humanity: A Further Discussion of the Ethics of the World War and the Attitude and Duty of the United States by James M. Beck (1861-1936) was a sequel to that author's earlier book The Evidence in the Case as to the Moral Responsibility for the War (1915). However, The War and Humanity had a more partisan tone than The Evidence in the Case.

The German Soul In Its Attitude Toward Ethics and Christianity, the State and War (1916), by Friedrich von Hügel

A discussion that began when World War I broke out—the influence of the German personality on the war—was continued in The German Soul In Its Attitude Towards Ethics and Christianity, The State and War. When the war started in August 1914, much attention was given to the 1911 book Germany and the Next War, by Frederick von Bernhardi.

Four Weeks in the Trenches (1915), by Fritz Kreisler

World War I took millions of people from their chosen work, including many well-known individuals. These included the famous Austrian violinist Fritz Kreisler, whose short involvement in the war in August and September of 1914 is realistically and humanly chronicled in Four Weeks in the Trenches: The War Story of a Violinist.

The First Seven Divisions (1916), by Ernest W. Hamilton

The entry of England into the European war of August 1914 is often seen as the official start of World War I. The First Seven Divisions by Ernest W. Hamilton (1858-1939) is a detailed account of how those first British troops influenced the early months of the war.

They Shall Not Pass (1916), by Frank H. Simonds

Historical accounts of the long and costly Battle of Verdun in 1916 usually discuss the influence of French politics on the battle.

These politics are a main topic in They Shall Not Pass, by the prominent war correspondent and historian Frank H. Simonds (1878-1936), who earlier wrote the 1914 book The Great War: The First Phase.

The Writing on the Wall: The Nation on Trial (1916), by Eric Fisher Wood

As World War I raged in Europe, many people in the United States thought more seriously about how well the United States could defend itself against an attack by another country.

The Writing on the Wall: The Nation on Trial by Eric Fisher Wood (1889-1962) added to the discussion of such concerns, following the earlier publication of books like American and the World War (1915), by Theodore Roosevelt.

Above the Battle (1916), by Romain Rolland

Most books about World War I that were published during the war included some observations about the moral and ethical issues of the war—what was right and wrong, how people were treating each other.

These issues were the main focus of Above the Battle, by Romain Rolland (1866-1944). He was the famous French author of the long novel Jean-Christophe, which was published between 1904 and 1912 and helped Rolland earn the Nobel Prize for Literature in 1915.