| OGLESBY, Richard James 'Uncle Dick' |
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| Born | July 25 1824, Oldham Cty KY |
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| Died | April 24 1899, Elkhart IL |
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| Pre-War Occupation | Farmhand, carpenter, lawyer, Mexican war, gold prospector, politician. |
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| Post-War Occupation | Governor of Illinois, lawyer, US senator. |
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| War Involvement | April 1861 Col. of 8th Illinois, commanded 1st Bde/1st Divn at Fts Henry and Donelson, March 1862 appointed Brig. Gen. of Volunteers, commanded 2nd Bde/2nd Divn at the battle of Corinth (w), November 1862 promoted Maj. Gen. of Volunteers, commanded a division in west Tennessee and north Mississippi, resigned May 1864. |
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| OLIVER, John Morrison |
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| Born | September 6 1828, Penn Yan NY |
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| Died | March 30 1872, Washington DC |
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| Pre-War Occupation | Pharmacist, court recorder. |
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| Post-War Occupation | Lawyer, internal revenue assessor, postal service official. |
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| War Involvement | June 1861 Lt. in 4th Michigan, Capt., March 1862 Col. of 15th Michigan, Shiloh, commanded a brigade in battle of Corinth, Vicksburg campaign, commanded 3rd then 1st Bde/4th Divn/XV Corps in Atlanta campaign, commanded 3rd Bde/2nd Divn/XV Corps in March to the Sea, January 1865 appointed Brig. Gen. of Volunteers, Carolinas campaign. |
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| OPDYKE, (Samuel) Emerson |
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| Born | January 7 1830, Trumbull Cty OH |
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| Died | April 25 1884, New York NY |
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| Pre-War Occupation | Merchant. |
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| Post-War Occupation | Businessman. |
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| War Involvement | August 1861 1st Lt. in 41st Ohio, Capt., Shiloh, recruited 125th Ohio - Lt. Col., January 1863 Col., Chickamauga, commanded a half-brigade at Missionary Ridge, commanded 1st Bde/2nd Divn/IV Corps in Atlanta campaign, Resaca (w), Kennesaw Mountain, Spring Hill, Franklin, July 1865 appointed Brig. Gen. of Volunteers. |
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| Notes | A fine civilian soldier, his brigade defended fiercely at Franklin. |
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| ORD, Edward Otho Cresap |
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| Born | October 18 1818, Cumberland MD |
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| Died | July 22 1883, Havana, Cuba |
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| Pre-War Occupation | Graduated West Point 1839, Seminole war, served in California during the Mexican war, participated in the capture of John Brown. |
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| Post-War Occupation | Army service commanding various departments, retired 1881. |
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| War Involvement | 1861 Capt. in 3rd US Artillery, September 1861 appointed Brig. Gen. of Volunteers, defences of Washington, Dranesville, May 1862 promoted Maj. Gen. of Volunteers, commanded 2nd Divn/Dist. of Jackson at Corinth, Hatchie (w), commanded XIII Corps in Vicksburg campaign, served in the Dist. of the Gulf, commanded XVIII Corps at Ft Harrison, commanded the Army of the James and Dept of North Carolina after Butler left. |
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| ORME, William Ward |
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| Born | February 17 1832, District of Columbia |
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| Died | September 13 1866, Bloomington IL |
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| Pre-War Occupation | Lawyer. |
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| Post-War Occupation | Special agent of US Treasury. |
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| War Involvement | August 1862 Col. of 94th Illinois, Prairie Grove, November 1862 appointed Brig. Gen. of Volunteers, commanded 2nd Bde/Herron's Divn in Vicksburg campaign, inspector of prison camps, resigned April 1864. |
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| Notes | He died of tuberculosis contracted in the Vicksburg campaign. |
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| OSBORN, Thomas Ogden |
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| Born | August 11 1832, Jersey OH |
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| Died | March 27 1904, Washington DC |
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| Pre-War Occupation | Lawyer. |
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| Post-War Occupation | Lawyer, county treasurer, US minister to Argentina, businessman in South America. |
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| War Involvement | 1861 recruited 39th Illinois - Lt. Col., January 1862 Col., Ft Wagner (w), commanded 2nd Divn/XVIII Corps at Morris Is., Drewry's Bluff (w), commanded 1st Bde/1st Divn/XXIV Corps at Ft Gregg, May 1865 appointed Brig. Gen. of Volunteers. |
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| OSTERHAUS, Peter Joseph |
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| Born | January 4 1823, Coblenz, Prussia |
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| Died | January 2 1917, Duisburg, Germany |
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| Pre-War Occupation | Served in Prussian army, emigrated to US 1849, businessman. |
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| Post-War Occupation | Army service, US consul to France, factory owner and exporter, US deputy consul at Mannheim, Germany. |
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| War Involvement | April 1861 Maj. in Missouri Bn, Wilson's Creek, December 1861 Col. of 12th Missouri, commanded 2nd Bde at Pea Ridge, June 1862 appointed Brig. Gen. of Volunteers, commanded 9th Divn/XIII Corps in Vicksburg campaign, Big Black River (w), commanded 1st Divn/XIV Corps at Missionary Ridge, July 1864 promoted Maj. Gen. of Volunteers, commanded 1st Divn/XV Corps in Atlanta campaign, commanded XV Corps in March to the Sea, Carolinas campaign, served in Divn. of West Mississippi. |
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| OWEN, Joshua Thomas 'Paddy' |
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| Born | March 29 1821, Caermarthen, Wales |
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| Died | November 7 1887, Philadelphia PA |
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| Pre-War Occupation | Lawyer, politician, served in state militia. |
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| Post-War Occupation | Lawyer, editor of a law journal. |
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| War Involvement | May 1861 Col. of 24th Pennsylvania, August 1861 Col. of 69th Pennsylvania, Seven Pines, Seven Days, Antietam, November 1862 appointed Brig. Gen. of Volunteers - appointment expired March 1863, commanded 2nd Bde/2nd Divn/II Corps at Fredericksburg, March 1863 reappointed Brig. Gen. of Volunteers, Chancellorsville, arrested on the march to Pennsylvania, Wilderness, Spotsylvania, Cold Harbor, mustered out July 1864. |
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| Notes | He was accused of failing to support a neighboring brigade at Cold Harbor. |
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