News of the World for May 1917 - Warbirds Rising Group:

May 1
The Polish Council of State presented demands to the Central Powers regarding the creation of an independent Poland.
May 2
The first USA destroyer flotilla arrived at Queenstown in Cork, Ireland.
May 3
The Third Battle of the Scarpe and the Second Battle of Bullecourt began during the Arras Offensive.
May 4
French forces captured Craonne on the Chemin des Dames ridge.
May 5
A major military engagement was fought between the forces of the Central Powers and the Entente near Vardar as part of the Allied Spring Offensive, designed to break the stalemate on the Macedonian Front.
May 7
With support from Australian troops part of Bullecourt was seized by the British.
May 8
Germans recaptured Fresnoy on the Arras front.
May 9
French, Russian and Serbian troops launched a coordinated offensive in Macedonia, but Bulgarian and German defenders repulsed them.
May 10
Major General John J. Pershing was appointed to command the United States Expeditionary Force.
May 11
British and French war commissioners paraded down Fifth Avenue in America to celebrate the United States' entry into the war. The slogan "Show your colours" brought forth a patriotic flurry of Union Jacks, Tricolores and Stars and Stripes.
May 12
The Tenth Battle of the Isonzo began when once again Italian and Austro-Hungarian troops battled each other along the Isonzo River.
May 14
The German Zeppelin L22 was destroyed in the North Sea by a British flying boat during a reconnaissance mission.
May 15
Fourteen British drifters were sunk in the Otranto Straits when British and Austrian naval forces clashed.
Philippe Petain replaced Robert Nivelle as Commander-in-Chief of the French Army. He was tasked with turning back an imminent German offensive and quelling the mutinies in the French army.
May 17
Honduras severed diplomatic relations with Germany.
Following fierce German resistance the Second Battle of Bullecourt ended. Few of the initial objectives had been met.
May 18
The Compulsory Service Act became law in the United States. All American men aged 21-30 had to register for the draft.
May 19
The United States Government announced it would send a Division of the US Army to France.
May 20
Thanks to the actions of the French Commander-in-Chief, Philippe Petain, a month of sporadic mutinies in the French army came to an end.
May 21
British troops captured the Siegfried line from Bullecourt to one mile east of Arras.
May 22
Brigadier-General Nash succeeded Sir Eric Geddes as Director-General of Transportation.
Count Istvan Tisza resigned as Prime Minister of Hungary.
May 24
The British Royal Navy introduced a newly created convoy system, whereby all merchant ships crossing the Atlantic Ocean would travel in groups under the protection of the British navy.
May 25
Heavy casualties were sustained in a German aeroplane raid on Folkestone, Kent on the southeast coast of England.
May 26
HMS Dover Castle was torpedoed and sunk by the German submarine UC-67 in the Mediterranean en route from Malta to Gibraltar.
May 28
An Anglo-French conference in London discussed the deposition of King Constantine of Greece and considered the occupation of Athens and Thessaly.
May 29
The French liner SS Yarra was torpedoed and sunk by the German submarine UC-74 near Kreta in Greece.
May 30
The South African military commander General Jacob van Deventer succeeded Major General Reginald Hoskins in command of British forces in East Africa.

(From The Great War - Unseen Archives by Robert Hamilton)