On This Day - 21 May 1917
Theatre definitions: Western Front comprises the Franco-German-Belgian front and any military action in Great Britain, Switzerland, Scandinavia and Holland. Eastern Front comprises the German-Russian, Austro-Russian and Austro-Romanian fronts. Southern Front comprises the Austro-Italian and Balkan (including Bulgaro-Romanian) fronts, and Dardanelles. Asiatic and Egyptian Theatres comprises Egypt, Tripoli, the Sudan, Asia Minor (including Transcaucasia), Arabia, Mesopotamia, Syria, Persia, Afghanistan, Turkestan, China, India, etc. Naval and Overseas Operations comprises operations on the seas (except where carried out in combination with troops on land) and in Colonial and Overseas theatres, America, etc. Political, etc. comprises political and internal events in all countries, including Notes, speeches, diplomatic, financial, economic and domestic matters. Source: Chronology of the War (1914-18, London; copyright expired)
British capture "Siegfried" line from Bullecourt to one mile east of Arras (bar 2,000 yards).
French claim great success on Moronvilliers ridge and ground held.
Activity on California Plateau and near Craonne.
Severe fighting in the Travignolo Valley (Trentino); enemy penetrate and are later ejected.
U.S.A. Division to start at once for France under General Pershing.
M. Albert Thomas, French Minister of Munitions, speaks with effect in Moscow.
Debate in House of Commons on proposed Irish Convention.