A Military Dictionary and Gazetteer / Comprising ancient and modern military technical terms, historical accounts of all North American Indians, as well as ancient warlike tribes; also notices of battles from the earliest period to the present time, with a concise explanation of terms used in heraldry and the offices thereof. The work also gives valuable geographical information. Compiled from the best authorities of all nations. With an appendix containing the Articles of war, etc.

by Thomas Wilhelm

Odius. A herald in the camp of the Greeks before Troy.

Odometer. An instrument attached to the wheel of a carriage to measure distances in traveling, indicating on a dial the number of revolutions made by the wheel.

Odrysæ. The most powerful people in Thrace, dwelt, according to Herodotus, on both sides of the river Artiscus, a tributary of the Hebrus, but also spread farther west over the whole plain of the Hebrus. Their king Teres retained his independence of the Persians 508 B.C. Sitalces, his son, enlarged his dominions, and in 429 aided the Athenians against Perdiccas II. of Macedon with an army of 150,000 men. Sitalces was killed in battle with the Triballi, 424. Cotys, another king (382-353), disputed the possession of the Thracian Chersonesus with Athens; after nine or ten years’ warfare, Philip II. of Macedon reduced the Odrysæ to tributaries.

Œniadæ (now Triyardon, or Trikhardo). An ancient town of Acarnania, situated on the Achelous, near its mouth. Œniadæ espoused the cause of the Spartans in the Peloponnesian war. At the time of Alexander the Great, the town was taken by the Ætolians, who expelled the inhabitants; but the Ætolians were expelled in their turn by Philip V., king of Macedonia, who surrounded the place with fortifications. The Romans captured and restored the town to the Acarnanians 211 B.C.

Œnophyta (now Inia). A town in Bœotia, on the left bank of the Asopus, and on the road from Tanagra to Oropus, memorable for the victory gained here by the Athenians over the Bœotians, 456 B.C.

Oesel. An island belonging to Russia, stretches across the mouth of the Gulf of Riga. It at one time belonged to the Teutonic knights, but was seized by the Danes at an early period, and ceded by them to Sweden in 1645. In the beginning of the 18th century it was taken possession of by Russia, to which power it was finally ceded in 1721.

Ofanto (anc. Aufidus). A river of Naples, which rises in the province of Principato Ultra, and after a course of 75 miles flows into the Adriatic, 4 miles from Barletta. Near its mouth was fought the famous battle of Cannæ, in which the Romans were defeated by Hannibal.

Off, To Go. To be discharged, as a gun.

Off, To March. To quit the ground on which you are regularly drawn up, for the purpose of going upon detachment, relieving a guard, or doing any other military duty.

Off, To Tell. To count the men composing a battalion or company, so as to have them readily and distinctly thrown into such proportions as suit military movements or evolutions.