World War I Day by Day is a chronological history of the conflict from the opening shorts at Sarajevo in June 1914 to the armistice in November 1918. All of the major war theaters are covered, as is the fighting in the air and at sea. The dated entries also discuss espionage, home fronts, politics, and technology.
In addition, there are a number of longer features highlighting the conflict's decisive weapons, key personalities and events, and strategy and tactics. The book also contains 400 photographs and maps.