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Oak Grove, battle of, 25 June 1862
Ober-Mörlen, combat of, 9 July 1796
Ocaña, battle of, 11 November 1809
Ocaña, combat of, 11 November 1809
Ochenskopf, Operation, 26 February – 19 March 1943
Octodurus, battle of, winter 57/56 B.C.
Odon counterattack, 29 June-1 July 1944
Offheim, combat of, 7 July 1796
Oitabén River, combat of the, 7-8 June 1809
Okinawa, April-June 1945, I: Preparation
Okinawa, April-June 1945, I: The Battle
Öländ, battle of, 12-13 August 1564
Old Fort Wayne, battle of, 22 October 1862
Olive, Operation (25 August-October 1944) - First attack on the Gothic Line
Olivenza, siege of, 11-22 January 1811
Olivenza, siege of, 9 April-15 April 1811
Olpae, battle, 426
Olynthus, battle of, 382 BC
Olynthus, battle of, 381 BC
Olynthus, siege of, early 479 BC
Olynthus, siege of, 348 BC
Omaha Beach, 6 June 1945
Oneglia, combat of, 7 May 1800
Oporto, battle of, 29 March 1809
Oporto, battle of, 12 May 1809
Orchard Knob, battle of, 23 November 1863
Orchomenus, battle of, c.352 BC
Orchomenus, battle of, 86 B.C.
Orchomenos, siege of, 418 BC
Orlau-Frankenau, battle of, 24 August 1914 (East Prussia)
Orleans, siege of, September 1428 to May 1429
Orleans, siege of, 4 February-March 1563
Orontes, battle of the, 28 June 1098 (First Crusade)
Oropesa, siege of, 19 September-11 October 1811
Ortona, battle of, 20-27 December 1943
Oslo, German attack on, 9 April 1940
Ospedaletto, combat of, 11 April 1809
Ostrolenka, combat of, 16 February 1807
Ostrovno, battle of, 25-26 July 1812
Otterburn, battle of, 5 August 1388
Ouche, battle of the, 500
Oudenaarde, battle of, 11 July 1708 (Belgium)
Ourcq River, battle of the, 5-9 September 1914
Ourthe, battle of the, 18 September 1794
Overlord, Operation / Battle of Normandy (6 June to 25 August 1944)
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