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Battle of Okehazama
The Battle of Okehazama (桶狭間の戦い) was fought in 1560 at Okehazama in Owari Province, Japan, where Oda Nobunaga, with about 3,000 men, defeated and killed Imagawa Yoshimoto despite a large disparity in numbers.
Battle of Okhmativ
The Battle of Okhmativ (Охматівська битва) was a four-day battle fought near Okhmativ, Ukraine, in 1655 between Polish-Tatar and Cossack-Muscovite armies, ending without a victor.
Battle of Okinawa (沖縄戦)
The Battle of Okinawa (沖縄戦) was the largest land battle of the Pacific War, fought on Okinawa Island in 1945, followed by 27 years of American occupation.
Battle of Okitanawate
The Battle of Okitanawate (沖田畷の戦い) was a 1584 battle near Shimabara in Hizen Province, where a Shimazu–Arima coalition defeated the much larger Ryūzōji army and killed its leader, Ryūzōji Takanobu.
Battle of Okpo
The Battle of Okpo (옥포해전) was a 1592 naval battle off Okpo on Geoje Island, where a Joseon fleet under Yi Sun-sin destroyed 26 Japanese ships under Todo Takatora.
Battle of Ollantaytambo
The Battle of Ollantaytambo was a January 1537 Inca victory at the fortress town of Ollantaytambo, Peru, where Manco Inca defeated Hernando Pizarro's Spanish force.
Battle of Olshanitsa
The Battle of Olshanitsa (Ольшаницька битва) was a 1527 victory of the Grand Duchy of Lithuania, whose cavalry destroyed a Crimean Tatar raiding force near Kiev.
Battle of Olszynka Grochowska
The Battle of Olszynka Grochowska, also called the Battle of Grochów, was the largest battle of the November Uprising, fought near Warsaw on 25 February 1831.
Battle of Oltenița
The Battle of Oltenița, also spelled Oltenitza, was fought at Oltenița on the Danube in Wallachia on 23 October 1853, the first engagement of the Crimean War.
Battle of Omdurman (معركة أم درمان)
Battle of Omdurman (معركة أم درمان), also Battle of Kerreri, 2 September 1898: Kitchener's Anglo-Egyptian army of about 25,000 with artillery, Maxims, and gunboats destroyed the Khalifa's roughly 52,000 Mahdists, ending the Mahdist state.
Battle of Ongal
The Battle of Ongal (Битката при Онгъла) was a 680 victory of Khan Asparuh's Bulgars over Emperor Constantine IV, leading to the First Bulgarian Empire.
Battle of Opis
The Battle of Opis, fought on the Tigris in October 539 BC, was the decisive Persian victory of Cyrus the Great over Nabonidus's Babylonian army, leading to Babylon's fall.
Battle of Oranik
Battle of Oranik: two 15th-century victories of Skanderbeg over Ottoman armies at Oranik near Debar, in 1448 against Mustafa Pasha and in 1456 against the defector Moisi Arianit Golemi.
Battle of Orbulak
The Battle of Orbulak (Орбұлақ шайқасы) was a 1643 battle in which Kazakh ruler Zhangir Khan, with a small force, stopped a much larger Dzungar army under Erdeni Batur.
Battle of Orbulaq
The Battle of Orbulaq (Орбұлақ, also Orbulak) was a 1643 battle of the Kazakh-Dzungar wars in which 600 Kazakh warriors under Sultan Zhangir halted a Dzungar army.
Battle of Oriskany
The Battle of Oriskany, also called the Battle of Oriska, was a bloody 1777 Revolutionary War ambush in New York's Mohawk Valley during the Saratoga campaign.
Battle of Ormoc Bay
The Battle of Ormoc Bay was a series of naval and air actions in November and December 1944 that cut Japan's last supply route to Leyte in the Philippines.
Battle of Ormoc Valley
The Battle of Ormoc Valley was the final land phase of the 1944 Leyte Campaign, in which US forces drove the Japanese 35th Army from Leyte.
Battle of Oroscopa
The Battle of Oroscopa, or Oroscopis, was the 151/150 BC defeat of a Carthaginian army under Hasdrubal by Massinissa, king of Numidia, after he besieged Oroscopa.
Battle of Orsha
The Battle of Orsha (Bitwa pod Orszą) was fought in 1514 near Orsha on the Dnieper, where Polish-Lithuanian forces under Konstanty Ostrogski routed a Muscovite army.
Battle of Osan
The Battle of Osan was the first US ground engagement of the Korean War, fought on July 5, 1950, where Task Force Smith was routed by North Korean forces.
Battle of Osogbo
The Battle of Osogbo, conventionally dated to about 1840, saw an allied army led by Ibadan defeat an invading Ilorin Emirate force and lift its siege of the Yoruba town of Osogbo.
Battle of Ostrołęka (1831)
The Battle of Ostrołęka, fought on 26 May 1831, was a Polish defeat by Russian forces under Ivan Dybicz and the turning point of the November Uprising.
Battle of Osuchy
The Battle of Osuchy (Bitwa pod Osuchami) was a June 1944 battle in the Solska Forest between Polish partisans and German forces, ending in a German victory.
Battle of Otlukbeli
The Battle of Otlukbeli (Otlukbeli Muharebesi), fought on 11 August 1473 near Tercan, ended in an Ottoman victory of Mehmed II over Uzun Hasan's Aq Qoyunlu.
Battle of Otumba
The Battle of Otumba (Batalla de Otumba), fought on 7 July 1520 near Otumba in Mexico, saw Hernán Cortés's retreating Spaniards and Tlaxcaltecs defeat the pursuing Mexica army.
Battle of Ouadi Doum
The Battle of Ouadi Doum was a 1987 battle of the Chadian–Libyan conflict in which Chadian forces captured Libya's main air base in northern Chad.
Battle of Ouagadougou
The Battle of Ouagadougou was the capture of Ouagadougou, capital of the Mossi kingdoms in present-day Burkina Faso, by a French column under Voulet and Chanoine in 1896.
Battle of Oudong
Battle of Oudong, March 1974 Cambodian Civil War engagement: Khmer Rouge forces captured the former royal capital of Oudong, 34 km northwest of Phnom Penh, massacred the garrison, displaced about 20,000 people, and lost the ruined town to a FANK recapture in July 1974.
Battle of Paardeberg
The Battle of Paardeberg was a Second Boer War battle and siege at the Modder River in February 1900, ending in General Piet Cronjé's surrender to Lord Roberts.