Fought September 19, 1864, between 13,000 Confederates, under General Early, and 45,000 Federals, under General Sheridan. Success at first inclined to the side of the Southerners, but their left wing was broken by a charge of 7,000 cavalry, under Custer, and the Confederates were completely routed and fled in confusion. Oporto (Peninsular War). Fought March 28, 1809, when the French, under Soult, completely defeated the Portuguese under Lima and Pareiras, outside the city of Oporto. Soult followed up his success by storming Oporto, with horrible slaughter, it being computed that 10,000 of the inhabitants perished. The French lost 500 only. Oran (Ximenes’ Expedition to Morocco). Fought May 17, 1509, between the Moors and the Spaniards, under Navarro. The Spaniards, late in the evening, attacked and drove off the Moors from a strong position on the heights above the city. They then stormed the city itself, escalading the walls by placing their pikes in the crevices of the stones. The Moors lost in the battle and the storm 4,000 killed and about 8,000 prisoners, while the losses of the victors were very small. Orchomenus (First Mithridatic War). Fought B.C. 85, between the Pontic army, under Archelaus, and the Romans, under Sulla. The Asiatic cavalry attacked and drove back the Roman line, but Sulla himself rallied his troops, and led them in a charge which totally routed the enemy with heavy loss. Ordovici, The. Fought A.D. 50, between the Romans, under Ostorius Scapula, and the Britons, under Caractacus. The Britons occupied the slope of a hill, where they were attacked by the Romans and totally routed. Caractacus fled to the Brigantes, by whom he was surrendered, and sent a captive to Rome. Orleans (Hundred Years’ War). This city was besieged by the English, under the Regent, the Duke of Bedford, in October, 1428. In April, 1429, a French force, 7,000 strong, under Dunois and Joan of Arc, succeeded in entering, it having been found impossible to invest the place completely. After various successful attacks on the batteries erected by the besiegers, Joan, on the 6th and 7th of May, led the garrison to victory against the English lines, and on the 8th Bedford was compelled to raise the siege. Orthez (Peninsular War). Fought February 27, 1814, between the British under Wellington, and the French, under Soult. The French were driven out of Orthez and across the Luy de Béarn, with a loss of 4,000 killed and wounded, and 6 guns. Oruro. Fought 1862, between the Bolivian Government troops, under the President, General Acha, and the rebels, under General Perez, who had proclaimed himself President. Perez was utterly routed. Ostend (Netherlands War of Independence).