A look at the major events in the conflict during July 1918:
The US troop transport ship USS Covington is torpedoed by German submarine U-86 off Brest, France.
Turkish Sultan Mohammed V of the Ottoman Empire dies at the Yildiz Palace in Constantinople and is succeeded by his brother Mohammed VI.
The Battle of Hamel takes place, the successful attack being launched by the Australian Corps and American troops against German positions in and around the town of Hamel in northern France.
The Treaty of Bucharest, which had been signed between Romania and the Central Powers in May, is ratified by the Romanian Senate.
Wilhelm von Mirbach, the German ambassador to Russia, is assassinated in Moscow. He is succeeded by Karl Heifferich.
Ernest Hemmingway is severely wounded carrying a fellow worker to safety while working as a Red Cross ambulance driver on the Austro-Italian front. Hemmingway was sent home and later received the Italian Silver Medal of Bravery for his heroism. His novel A Farewell to Arms is based on his time serving in this war.
Paul von Hintze succeeds Richard von Huhlmann as Germany’s Minister for Foreign Affairs.
The Russian Constitution is adopted by the Congress of Soviets.
Henry Ford’s innovative new type of anti-submarine vessel, the first Eagle class patrol craft is launched in the United States.
The Imperial Japanese Navy battleship UN Kawachi sinks in Tokuyama Bay after an ammunition magazine explodes.
Turkish forces attack British positions on the River Jordan and begin their final offensive to recover Jericho.
US Air Service pilot and son of former US President Theodore Roosevelt, Quentin Roosevelt is shot down and killed b a German Fokker plane over the River Marne in France.
The Second Battle of the Marne begins and marks the final phase of the German Spring Offensive with German troops attacking French troops.
Austro-Hungarian Commander-in-Chief Field Marshal Conrad von Hotzendorf is relieved of his command.
In the early hours of the morning at a house in the town of Ekaterinburg Tsar Nicholas II, his wife Alexandra, and their children Alexei, Olga, Tatiana, Maria and Anastasia, are executed together with other members of their household by the Bolsheviks.
A French led counterattack halts the German forward momentum during the Second Battle of the Marne and seizes the initiative for the Allies on the Western Front.
The British troopship HMS Justicia sinks after being torpedoed by the German submarines UB-64 and UB-124 of the coast of Scotland whilst sailing from Belfast to New York.
The British destroyers HMS Marne, Milbrook and Pigeon attack UB-124 with depth charges and sink the German submarine with gunfire as she surfaces.
The Attack on Orleans takes place when a German U-boat opens fire on the US town of Orleans, Massachusetts and several merchant ships nearby. A tugboat is sunk but the town only sustains minor damage in the naval aerial action.
The Battle of Soissons between French and American troops and the German armies ends after four days with the Allies recapturing most of the ground lost to the German Spring Offensive in May 1918.
French and American troops advance south of Ourcq towards Fere-en-Tarenois and along the Marne in the Forest of Fere.
Baron Max Hussarek von Heinlein replaces Ernst Seidler von Feuchtenegg as Prime Minister of Austria.
A coup d’etat overthrow the Bolsheviks in Baku and launch the Battle of Baku between the Ottoman-Azerbaijani coalition forces and Bolshevik forces. The battle is fought as the conclusive part of the Caucasus Campaign.
Allied forces recapture Fere-en-Tardenois as the northward advance continues from Marne.
General Field Marshal Hermann von Eichhorn is assassinated in Kiev by the Socialist-Revolutionary Boris Mikhailovich Donskoy.