O
Oberstein.
Fought 1533, between the Poles, under Tarnowski, and the Wallachians, under Bogdan. The Wallachians were signally defeated, with heavy loss.
Obligado (Uruguayan War of Independence).
Fought November, 1845, between the Argentine fleet, under Oribe, and the combined French and British squadrons[squadrons]. The allies were victorious, and Oribe was forced to raise the siege of Montevideo, while the waters of the Parana were opened to the shipping of all nations.
Ocaña (Peninsular War).
In this action, at which Joseph Buonaparte was present, Soult, with 30,000 French, defeated 53,000 Spaniards, under Areizaga, with a loss of 5,000 killed and wounded, 26,000 prisoners, including 3 generals, 45 guns, and all their baggage and transport. The French only lost 1,700 men.
Ocean Pond (American Civil War).
Fought February 20, 1864, between 5,000 Confederates, under General Finnegan, and 6,000 Federals, under General Seymour. The Confederates occupied a strong position, protected by swamps and forests, near Lake City, where they were attacked by Seymour, whom they defeated with a loss of 1,200 men and 5 guns. The Confederates loss amounted to 700.