Oporto. A city of Portugal, in the province of Entre-Douro-e-Minho, about 2 miles from the mouth of the Douro, and 175 miles north from Lisbon. It was attacked by the Moors under Abderrahman in 820. In 1092 certain knights of Gascony, commanded by Don Alfonso Fredrico, captured it from the Moors. It was famous for the strength of its fortifications during the Middle Ages, its walls being 3000 paces in circumference, 30 feet in height, and flanked with towers. From the 17th to the present century, Oporto has been the scene of an unusual number of popular insurrections. In 1808 it was taken by the French. The French, under Marshal Soult, were surprised here by Lord Wellington, and defeated in an action fought May 11, 1809. It was besieged in 1832 and 1833 by Dom Miguel, and successfully defended by Dom Pedro with 7500 men. In this siege, the city suffered severely, and more than 16,000 of the inhabitants were killed. It has since been the scene of civil war. The insurgents entered Oporto January 7, 1847; a Spanish force entered Oporto, and the Junto capitulated, June 26, 1847.
Oppenheim. A town of the grand duchy of Hesse-Darmstadt, on the left bank of the Rhine, 10 miles southeast of Mayence. It occupies the site of the Roman castle of Bauconia, and was made a royal palatinate under the Carlovingians. It afterwards became one of the most important free towns of the empire. It was taken in 1218 by Adalbert, archbishop of Mayence, in 1620 by the Spaniards, in 1631 by the Swedes under Gustavus Adolphus, and in 1634 by the Imperialists, suffering much upon all these occasions. In 1689 the French under Melac almost entirely destroyed it.
Opponent. One who oppones, or opposes; an adversary; an antagonist; a foe.
Oppose. To act as an adversary against another; to resist, etc. It likewise signifies to place as an obstacle.
Oppugn. To fight against, whether in attack, resistance, or simple opposition; to attack; to oppose; to resist.
Oppugnant. Tending to awaken hostility; hostile; opposing.
Or. In heraldry the metal gold, represented in heraldic engravings by an unlimited number of dots.
Oran. A seaport town of Algeria, about 220 miles west-southwest of Algiers; it is defended by strongly armed forts. The town of Oran was built by the Moors. It was taken by the Spaniards in 1509, by the Turks in 1708, and again by the Spaniards in 1732. It was taken by the French in 1831, and has since remained in their hands.
Orb. In tactics, is the disposing of a number of soldiers in circular form of defense. The orb has been thought of consequence enough to employ the attention of the famous Marshal de Puysegur, in his “Art of War,” who prefers this position to throw a body of infantry in an open country to resist cavalry, or even a superior force of infantry; because it is regular, and equally strong, and gives an enemy no reason to expect better success by attacking one place than another. Cæsar drew up his whole army in this form when he fought against Labienus. The whole army of the Gauls was formed into an orb, under the command of Sabinus and Cotta, when fighting against the Romans. The orb was generally formed six deep.
Orchomenus. A city of Bœotia, and the capital of the powerful tribe of the Minyæ, was situated near the western shore of Lake Copaic, on a hill which overlooked the windings of the Cephissus. Its original inhabitants are said to have been Thessalian emigrants, and its name was derived from Orchomenus, one of the kings of the Minyans. Homer compares its treasures to those of Egyptian Thebes, and tells us that it sent 30 ships to the Trojan war. Some time after this event it became a member of the Bœotian confederacy. During the Persian war, like the other towns of Bœotia, it abandoned the national cause. Its government was thoroughly aristocratic, and after the Peloponnesian war, when Thebes became a democracy, Orchomenus took part with Sparta, and shared in its first triumph over Thebes; but the victory of Epaminondas at Leuctra (371 B.C.) placed it at the mercy of the Thebans, who soon after destroyed it by fire, and sold its inhabitants as slaves. It was again rebuilt during the Phocian war, but was a second time destroyed in the reign of Philip of Macedon, who, however, once more rebuilt it; but it never again became prominent in history. The site is now occupied by the modern village of Skripú.