Beginning in April 1915, Herbert ordered his subordinates cease calling him " Sir ", and to address him only by the pseudonym " Captain William McBride.

With The Tramp, issued April 1915, Chaplin began to inject greater emotion into his pictures.

Plunkett had travelled to Germany in April 1915 to join Roger Casement.

The first use of poison gas on the Western Front was on 22 April 1915, by the Germans at Ypres, against Canadian and French colonial troops.

American chemist and inventor James Bert Garner is credited by American sources with the invention of the gas mask in April 1915.

On 25 April 1915, a force of British Empire and French troops landed at multiple places along the peninsula.

Under the secret Treaty of London signed in April 1915, Triple Entente powers promised Italy that it would gain Vlorë ( Valona ) and nearby lands and a protectorate over Albania in exchange for entering the war against Austria-Hungary.

Moseley was assigned to the force of British Empire soldiers that invaded the region of Gallipoli, Turkey, in April 1915, as a telecommunications officer.

Moseley served as a technical officer in communications during the Battle of Gallipoli, in Turkey, beginning in April 1915, where he was killed in action on 10 August 1915.

During heavy fighting he was captured by the Austrians in April 1915, when his division became isolated from the rest of the Russian forces.

* Order of St. George, 4th degree ( 9 August 1905 ) and 3rd degree ( 28 April 1915 )

Although Lowell did not discover Pluto, Lowell Observatory ( 690 ) did photograph Pluto in March and April 1915.

Although Volvo was incorporated in 1915 as a subsidiary of AB SKF, a Swedish ball bearing manufacturer, the auto manufacturer considers itself officially founded on 14 April 1927, when the first car, the Volvo ÖV 4 series, affectionately known as " Jakob ", rolled out of the factory in Hisingen, Gothenburg.

* April 15 – Arthur Lowe, British actor ( b. 1915 )

* April 5 – Booker T. Washington, American educator ( d. 1915 )

Booker Taliaferro Washington ( April 5, 1856 – November 14, 1915 ) was an African-American educator, author, orator, and advisor to Republican presidents.

Garros achieved the first ever shooting-down of an aircraft by a fighter firing through a tractor propeller, on 1 April 1915 ; two more victories over German aircraft were achieved on 15 and 18 April 1915.

On 18 April 1915, either Garros ' fuel line clogged or, by other accounts, his aircraft was downed by ground fire, and he glided to a landing on the German side of the lines.

Carter Henry Harrison, Jr. ( April 23, 1860, Chicago, Illinois-December 25, 1953 ; buried in Graceland Cemetery ) served as Mayor of Chicago ( 1897 – 1905 and 1911 – 1915 ).

Antonio Rodolfo Quinn Oaxaca ( April 21, 1915 – June 3, 2001 ), more commonly known as Anthony Quinn, was a Mexican and American actor, as well as a painter and writer.

In the event the Germans conducted a Flanders offensive at Ypres ( 22 April – 15 May 1915 ), making the Ypres salient more costly and harder to defend.

Later, however, the Sultan changed his orders and had Fakhr-al-Din and his family killed on 13 April 1635 in Istanbul, bringing an end to an era in the history of Lebanon, which would not regain its current boundaries until it was proclaimed a mandate state and republic in 1920.

Promoted to lieutenant on 15 April 1920, he transferred to the battlecruiser HMS Repulse in March 1921 and accompanied Edward on a Royal tour of India and Japan.

The Palestine Mandate was based on the principles contained in Article 22 of the draft Covenant of the League of Nations and the San Remo Resolution of 25 April 1920 by the principal Allied and associated powers after the First World War.

Around 400 of these were burned in a co-ordinated IRA operation around the country in April 1920.

( 6 January 1920 – 19 April 2004 ) was a British theoretical evolutionary biologist and geneticist.

After a post World War I League of Nations mandate was established over Lebanon in April 1920, France formed the Army of the Levant, which was later reorganized into the " Troupes Spéciales du Levant " ( Special Troops of the Levant ).

After the city's capture in April 1920, Beria was saved from execution only because there was no time to arrange it and Sergei Kirov saved him.

Maximilian Karl Emil " Max " Weber (; 21 April 1864 – 14 June 1920 ) was a German sociologist, philosopher, and political economist who profoundly influenced social theory, social research, and the discipline of sociology itself.

< tr bgcolor ="# DDEEFF ">< td >-< td > William Holman ( 2nd time )< td > Nationalist < td > 15 November 1916 < td > 12 April 1920

< tr bgcolor ="# FFE8E8 ">< td > 20 < td > John Storey < td > Labor < td > 13 April 1920 < td > 5 October 1921

He soon found himself in financial difficulties, and, in April 1920, he left for Paris, not wanting to return to Russia as a failure.

When Mustafa Kemal Atatürk and his colleagues formed the GNA in Ankara on April 23, 1920, Kâzım Karabekir's XV Corps was the only corps which had any combat value.

The details are as follows, Killed in action or died of wounds 378, 000 ; died of disease 186, 000 and an additional 87, 000 deaths of invalids from 12 Nov. 1918 until 30 April 1920 due to war related injuries.

* April 29 – Barend Biesheuvel, Dutch politician, Prime Minister of the Netherlands from 1971 until 1973 ( b. 1920 )

* April 30 – Sir Alf Ramsey, English football manager ( b. 1920 )

* April 20 – Christopher Robin Milne, English author and bookseller ( b. 1920 )

* April 25 – Saul Bass, American graphic designer ( b. 1920 )

* April 3 – Reginald De Koven, American composer and music critic ( d. 1920 )

* April 6 – Isaac Asimov, Russian-born author ( b. 1920 )

* April 11 – Alejandro Obregón, Colombian painter ( b. 1920 )

* April 16 – Neville Brand, American actor ( b. 1920 )

* April 4 – 1920 Palestine riots: Violence erupts between Arab and Jewish residents in Jerusalem ; 9 killed, 216 injured.

* April 12 – Robert Harron, American actor ( d. 1920 )

* April 21 – Max Weber, German sociologist ( d. 1920 )

* April 6 – Jeanne Hébuterne, French painter ( d. 1920 )