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.