Nore, mutiny at, [234-235]

North Sea Mine Barrage, see Mine Barrage

O.

Octavius, Roman emperor, at Actium, [61-69]

Ontario, campaign on Lake, [283]

Open Door Policy, [330], [447]

Oquendo, Spanish naval officer, [157]

Ordnance, early types of, [94]; introduced on ships, [146]; at Armada, [150]; breech-loading, [289]; rifled, [289]; long range, [374]

Oregon, U. S. battleship, cruise of, [314], [315]; at Santiago, [326], [327]

P.