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German machine gunners occupy a trench during World War I.

Weapons of World War I

The combination of 20th-century weapons and 19th-century tactics made World War I especially deadly.

Meeting of leaders in W.W.I, General Hindenburg, Kaiser William II, General Ludendorff examine maps during World War I in Germany.

Military Commanders of World War I

Learn more about the commanders of World War I.

American troops at the front in Italy. American soldiers on the Piave (river) front hurling a shower of hand grenades into the Austrian trenches, Varage, Italy; September 16, 1918. (World War I)

Leaders of World War I

French infantry coming into position at the Marne during World War I, 1914-18.

Battles of World War I

Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

Portrait of western lowland gorilla (Gorilla gorilla gorilla), Bayanga, Central African Republic

Gorilla gorilla, Sula sula, and Other Animals Whose Names Are Tautonyms—the Same for Genus and Species

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Britannica Celebrates 100 Women Trailblazers