The resulting explosions can be heard as far away as London and Dublin. The British detonate 19 large mines containing some 455 tonnes of explosive under the Messines Ridge in Belgium. Brigadier General Pershing leaves New York for France.
General Nivelle is sacked, ending his career.
The high levels of casualties cause unrest throughout the French army with a month-long series of mutinies breaking out. The Nivelle and Chemin des Dames Offensives end in disastrous failures for the French. The Canadians seize ground of great military importance, and inflict heavy casualties on the German Army. The United States of America declares war on Germany.Ĭanadian troops capture Vimy Ridge. President Woodrow Wilson addresses Congress and asks the House of Representatives to declare war on Germany. It contains details of the German proposal of an alliance with Mexico against America.Īs a consequence of the Russian Revolution, Tsar Nicholas II abdicates. The Zimmermann Telegram is passed to the United States government by the British. Laconia, sailing from New York to Liverpool, is sunk off the Irish coast by a German U-boat. The United States of America severs diplomatic ties with Germany. Lloyd George orders Royal Navy convoys to protect merchant ships destined for Britain. Over the next month close to a million tons of shipping would be lost.
All allied and neutral ships are to be sunk on sight. Germany resumes unrestricted U-boat warfare. The American states of Texas, Arizona and New Mexico would be offered to the Mexican government in return for such assistance. The British intercept and decode a telegram from the German Foreign Secretary Arthur Zimmermann to Mexico urging her entry into war against the United States. Important events of 1917 during the fourth and penultimate year of the First World War, including the surprise tank attack by the British (pictured above) at the Battle of Cambrai.
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