| Source: Annual Report of the Adjutant General of Missouri, 1863, 1864, and 1865 Location: MO / 353.6 / M69 | |
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| Last Name: | Brien |
| First Name: | Wm. |
| Middle Name: | O. |
| Last Name, Alternate Spelling: | O'Brien |
| Rank: | 2nd Lt. |
| Company: | A |
| Regiment: | 16th Regiment, Enrolled Missouri Militia |
| Page: | 408 |
| Publication Title: | Annual Report of the Adjutant General of the State of Missouri, December 31, 1863 |
