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 squadronssquadrons. 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.

Ockley (Danish Invasion).

Fought 851, between the Danes, and the West Saxons, under Ethelwulf. The Danes were completely defeated.

Oczakov (Ottoman Wars).

This fortress, defended by 10,000 Turks and Bosnians, was besieged 1737, by the Russians, under Count MÜnnich, and after the magazine had been blown up was stormed by the besiegers, and the garrison cut to pieces. In 1788 the place was again besieged by the Russians, under Potemkin, and after a strenuous resistance of six months, was taken by storm, December 17. In the massacre which followed, 40,000 of the garrison and inhabitants were put to the sword.

Odawara (Hojo Rebellion).

The castle of Odawara, the last stronghold of the Hojo family, was besieged by the Japanese Imperial troops, under Hideyoshi. The castle held out for over three months, but at last finding that they could hope for no support from without, the garrison surrendered, and the power of the Hojo family came to an end.

Œnophyta

Fought B.C. 457, between the Athenians, under Myronides, and the Thebans and other Boeotian states. The Boeotians were totally defeated, and were in consequence compelled to acknowledge the headship of Athens, and to contribute men to her armies.

Ofen (Hungarian Rising).

This fortress, held by an Austrian garrison, under General Hentzi, was besieged by the Hungarians, under GÖrgey, May 4, 1849. After an unsuccessful assault, a siege in due form was commenced, and several further assaults having also failed, the place was finally taken by storm on the 21st. General Hentzi was mortally wounded.

Ohud (Mohammed's War with the Koreish).

Fought 623, between 950 Moslems, under Mohammed, and 3,000 Koreish of Mecca, under Abu Sophian. The latter were victorious, 70 Moslems being slain, and the Prophet himself wounded, but Abu Sophian did not feel himself strong enough to follow up his victory by an attack upon Medina.

Olmedo.

Fought 1467, between the Spanish adherents of the Infante Alfonso, a claimant to the throne, under the Archbishop of Toledo, and the Royal troops, under Henry of Castile. After an action which began late in the afternoon, and lasted for three hours, without any very decisive result, the Archbishop, who was considerably inferior in numbers, withdrew his troops, leaving Henry in possession of the field.

OlmÜtz (Seven Years' War).

This place was besieged by Frederick the Great, May, 1758. Having insufficient troops to completely invest the place, Frederick's task was a difficult one, and Marshal Daun was able to keep communications open, and supply the town with provisions. After a siege of seven weeks, the Austrians captured a convoy of 4,000 waggons, under the escort of Landon, destined for the Prussian army, and Frederick was forced by this loss to raise the siege, and retire.

OlpÆ (Peloponnesian War).

Fought 426 B.C., between a small Athenian force, under Demosthenes, and a force of Ambraciots, with 3,000 Spartan hoplites, under Eurylochus. Demosthenes gained a complete victory, by means of an ambuscade, and Eurylochus was slain.

Oltenitza (Crimean War).

Fought 1853, when a Turkish army, superior in numbers, under Omar Pasha, totally defeated the Russian army which had invaded the Danubian Principalities.

Omdurman (Soudan Campaigns).

Fought September 2, 1898, between the British and Egyptians, 23,000 strong, under Sir Herbert Kitchener, and 50,000 Dervishes, under the Khalifa. The Dervishes attacked the British zareba, and were repulsed with heavy loss. Kitchener then advanced, to drive the enemy before him into Omdurman, and capture the place. In the course of the operation, however, the Egyptian Brigade on the British right, under General Macdonald, became isolated, and was attacked in front by the centre of the Dervish army, while his flank and rear were threatened by the Dervish left, which had not previously been engaged. The position was critical, but through the extreme steadiness of the Soudanese, who changed front under heavy fire, the attack was repulsed. The British and Egyptian losses were 500 killed and wounded. The Dervishes lost about 15,000.

Onao (Indian Mutiny).

Fought July 28, 1857, between Havelock's relieving force, 1,500 strong, and the rebels, who occupied a strong position near Onao, so protected on the flanks that a frontal attack was necessary. This was successful, and after the town had been passed, a further attack by the mutineers was repulsed, with a loss of 300 men and 15 guns.

Onessant.

Fought July 27, 1778, between 30 British ships of the line, under Admiral Keppel, and a French squadron of equal force, under the Comte d'Estaing. After a fight which lasted throughout the day, the two fleets drew off to repair damages, neither side having lost a ship.

Oondwa Nullah.

Fought September, 1763, when 3,000 British and native troops, under Major Adams, carried by storm the entrenchments and the fort held by Mir Cossim's army of 60,000 men with 100 guns. Mir Cossim fled and his army was entirely dispersed.

Ooscata.

Fought August 23, 1768, when the camp of the Mahratta contingent, under Morari Rao, forming a part of Colonel Donald Campbell's column, was attacked by a detachment of Hyder Ali's army. The Mahrattas repulsed the Mysore cavalry with a loss of about 300, at a cost to themselves of 18 only.

Opequan (American Civil War).

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.

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).

This place was besieged, July 5, 1601, by the Spaniards, under the Archduke Albert. The town made a most remarkable defence, holding out for more than three years, but Spinola having taken command of the besiegers, it was finally captured, September 14, 1604, by which time scarcely a house in the town was left standing. The Spaniards lost 70,000 men in the course of the siege.

Ostia (Italian Wars).

This place, held by a French garrison, under Menaldo Guerri, was besieged in 1500 by the Spaniards, under Gonsalvo de Cordova. After five days' bombardment, an attack was made upon the town on the opposite side by a small party of Spaniards resident in Rome, under Garcilasso de la Vega. Thus between two fires, Guerri surrendered.

Ostrolenka (Crimean War).

Fought 1853, between the Turks, under Omar Pasha, and the Russian army which had invaded the Danubian Principalities. The Turks, who were considerably superior in numbers, gained a complete victory.

Fought July 25 and 26, 1812, between the French corps of Ney and Prince EugÈne, with Murat's cavalry, and the Russian corps of Count Osterman and General Konownitzyn. The Russians were defeated and driven back on both days, with a loss of 3,000 killed and wounded, 800 prisoners and 8 guns. The French loss was about the same.

Oswego (Seven Years' War).

This place, held by a garrison of 1,400 Provincial troops, under Colonel Mercer, was besieged by the French, under Montcalm, August 11, 1756. After a bombardment of 3 days, in the course of which Mercer was killed, the place surrendered. The losses on both sides were very small.

Otrar (Tartar Invasion of Kharismia).

This city was besieged, 1219, by 200,000 Mongols, under Oktai and Zagatai, sons of Genghiz Khan, and defended by a garrison of 60,000, under Gazer Khan. The place was entered after a four months' siege, by which time the garrison was reduced to 20,000 men, but with this remnant Gazer Khan held out in the citadel for another month.

Otterburn (Scottish Wars).

Fought August 19, 1388, between 9,000 English, under Henry Percy (Hotspur) and a greatly inferior force of Scots, under Earls Douglas and Murray. Hotspur attacked the Scottish entrenchments, and was totally defeated, with a loss of about 2,000. The battle is celebrated in the old ballad of "Chevy Chace."

Otumba (Conquest of Mexico).

Fought July 8, 1520, between 200 Spaniards, with some thousands of Tlascalan auxiliaries, under Cortes, and a force of about 200,000 Aztecs. The Spaniards, wearied by a long march on their retreat from Mexico, were intercepted by the Aztecs, and after many hours' fighting, were on the verge of defeat, when a charge of a few cavaliers, headed by Cortes, into the very heart of the Aztec army, so discouraged them that they fled in disorder. It is said that 20,000 Aztecs fell.

Oudenarde (War of the Spanish Succession).

Fought July 11, 1708, between 80,000 British and Imperialists, under Marlborough and Prince Eugene, and 100,000 French, under the Duke of Burgundy and Marshal VendÔme. The French, who were besieging Oudenarde, raised the siege on the advance of the allies, and marched to meet them, but were totally defeated with a loss of 3,000 killed, 7,000 prisoners, and 10 guns. The allies lost 2,000.