Drawn up in 1914, the cross-licensing agreement became effective in 1915.

One reel -- from eight to twelve minutes -- became the standard length from the year of Robbery, 1903, until Griffith shattered that limit forever with Birth Of A Nation in 1915.

Only several years after its liberation ( 1878 ), Bulgaria became a regional military power and was involved in several major wars – Serbo-Bulgarian War ( 1885 ), First Balkan War ( 1912 – 13 ), Second Balkan War ( 1913 ), First World War ( 1915 – 1918 ) and Second World War ( 1941 – 1944 ), during which the Army gained significant combat experience.

During the course of 1915, Chaplin became a cultural phenomenon.

He graduated in the middle of the class of 1915, which became known as " the class the stars fell on ", because 59 members eventually became general officers.

Beatty's other brothers were Charles Harold Longfield ( 1870 – 1917 ) who served with distinction in the South Africa wars before dying from complications after losing an arm in Flanders, Richard George ( 1882 – 1915 ) who died on active service in India, William Vandeleur Schruder ( 1873 – 1935 ) who became an army Major and Newmarket horse trainer, and one sister Kathleen Roma ( 1875 –).

Haeckel's wife, Agnes, died in 1915, and Haeckel became substantially more frail, with a broken leg ( thigh ) and broken arm.

LaGuardia became Deputy Attorney General of New York in January, 1915.

After the sinking of the RMS Lusitania in 1915, public anti-German sentiment was widespread, and Marx's German character was booed, so he quickly dropped the accent and developed the fast-talking wise-guy character that became his trademark.

During the course of the war the area of Congress Poland became occupied by the Central Powers, with Warsaw captured by the Germans on 5 August 1915.

But when, in early 1915, the Allies asked for Greek help in the Dardanelles campaign, offering Cyprus in exchange, their diverging views became apparent: Constantine had been educated in Germany, was married to Sophia of Prussia, sister of Kaiser Wilhelm, and was convinced of the Central Powers ' victory.

In 1906 he moved to Paris and became friends with Henri Matisse, Georges Braque, Fernand Léger, then in 1915 he was painted by his friend, Amedeo Modigliani.

In 1915, Regret became the first filly to win the Kentucky Derby ( of only three in the history of the race ), and in 1917, the English-bred colt " Omar Khayyam " became the first foreign-bred horse to win the race.

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

In 1915 Keystone Studios became an autonomous production unit of the ambitious Triangle Film Corporation, as Sennett joined forces with movie bigwigs D. W. Griffith and Thomas Ince.

When Mendel's theories were integrated with the chromosome theory of inheritance by Thomas Hunt Morgan in 1915, they became the core of classical genetics.

Some countries in northwestern Europe had more liberal policies towards contraception than the United States at the time, and when Sanger visited a Dutch birth control clinic in 1915, she learned about diaphragms and became convinced that they were a more effective means of contraception than the suppositories and douches that she had been distributing back in the United States.

When the besieged garrison of Kaunas surrendered in 1915, 20, 000 Russians became prisoners.

Starting with the mostly original score composed by Joseph Carl Breil for D. W. Griffith's groundbreaking epic The Birth of a Nation ( USA, 1915 ) it became relatively common for the biggest-budgeted films to arrive at the exhibiting theater with original, specially composed scores.

Late in 1915 Lloyd George became a strong supporter of general conscription, and he helped to put through the conscription act of 1916.

Their son Michael, who became a barrister, was born in January 1915.

Dual-tone sirens became more common in the 1950s, but have been used in some areas since about 1915.

* 1915 – US Navy salvage divers raise F-4, the first U. S. submarine sunk in accident.

* 1915 – Sirimavo Bandaranaike, Sri Lankan politician and the world's first female head of government ( d. 2000 )

They acquired premises at Henniker Place in Kensington and produced their first car in March 1915.

From 1915 to 1918, Berg served in the Austro-Hungarian Army and during a period of leave in 1917 he accelerated work on his first opera, Wozzeck.

After recovering in early 1915, he was appointed to be brigade major first of 112th Brigade and then with 104th Brigade under training in Lancashire.

Wegener was the first to use the phrase " continental drift " ( 1912, 1915 ) ( in German " die Verschiebung der Kontinente " – translated into English in 1922 ) and formally publish the hypothesis that the continents had somehow " drifted " apart.

Presented in 1915 by Wolfgang Gaede and using mercury vapor, they were the first type of high vacuum pumps operating in the regime of free molecular flow, where the movement of the gas molecules can be better understood as diffusion than by conventional fluid dynamics.

The first book, Doctor Syn: A Tale of the Romney Marsh was published in 1915.

The first major challenge to conventional eugenics based upon genetic inheritance was made in 1915 by Thomas Hunt Morgan, who demonstrated the event of genetic mutation occurring outside of inheritance involving the discovery of the hatching of a fruit fly with white eyes from a family and ancestry of the red-eyed Drosophila melanogaster species of fruit fly.

Adelaide Crapsey codified the couplet form into a two line rhymed verse of ten syllables per line with her image couplet poem On Seeing Weather-Beaten Trees, first published in 1915.

The first Russian examples were all made by Yevgeni Bauer for Khanzhonkov during the First World War, and include Grezy, Schastye vechnoi nochi, and Posle smerti, all from 1915.

The first of these was Cecil B. DeMille, whose films, such as The Cheat ( 1915 ), brought out the moral dilemmas facing their characters in a more subtle way than Griffith.

Garros ' modified monoplane was first flown in March 1915 and he began combat operations soon thereafter.

The first victory for the Eindecker came on 1 July 1915, when Leutnant Kurt Wintgens, flying with the Feldflieger Abteilung 6 unit on the Western Front, forced down a Morane-Saulnier Type L two-seat " parasol " monoplane just east of Luneville.

* 1915 – World War I: The first naval attack on the Dardanelles begins when a strong Anglo-French task force bombards Ottoman artillery along the coast of Gallipoli.

The term " Fascism " was first used in 1915 by members of Mussolini's movement, the Fasci of Revolutionary Action.

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.

While the first reference to " guising " in North America occurs in 1911, another reference to ritual begging on Halloween appears, place unknown, in 1915, with a third reference in Chicago in 1920.

The ham was awarded first prize in the 1915 Panama International Merchandise Exhibition.

* 1915 – World War I: Germany is the first to make large-scale use of poison gas in warfare in the Battle of Bolimów against Russia.

* 1915 – RFC Captain Lanoe Hawker becomes the first British military aviator to earn the Victoria Cross, for defeating three German two-seat observation aircraft in one day, over the Western Front.

* 1915 – Lieutenant Kurt Wintgens achieves the first known aerial victory with a synchronized machine-gun armed fighter plane, the Fokker M. 5K / MG Eindecker.

* 1915 – Henry James becomes a British citizen, to highlight his commitment to England during the first World War.

* 1915 – World War I: German zeppelins bomb the towns of Great Yarmouth and King's Lynn in the United Kingdom killing more than 20, in the first major aerial bombardment of a civilian target.