I can get rosters for Co. C and Co. E but I'm not finding a Captain Oscar Brown in either company. I do find a 2nd Lt. John N Brown in Company E. He appears to have originally been a Sergeant in Co. K 3rd Wisconsin before getting promoted to 2nd Lt. in Co. G of the 15th Wisconsin. Now if you look in the 3rd's roster (http://www.wisconsinhistory.org/roster/results.asp?image_id=1576) it says he was promoted to 2nd Lt. in Co. E December 16, 1862. However, the Co. E roster (http://www.wisconsinhistory.org/roster/results.asp?image_id=1966) states that he came to Co. E from Co. G. Now the Co. G roster (http://www.wisconsinhistory.org/roster/results.asp?image_id=1971) seems to clear things up a little by saying he came to Co. G. 15th Wisconsin from Co. K 3rd Wisconsin and that he was recommisioned December 16th into Co. E. But it does list him as a 2nd Lt. in Co. G which would suggest he was either promoted from Sergeant after arriving in the 15th or before leaving the 3rd.
The Co. E roster does state he was wounded at Stone River and resigned April 9, 1863.
Thanks, I found info on Oscar Fitzallen Brown from a genealogy site. Not fro Wisconsin. He shows up when gggrandfather enlisted for second time with Mississippi Marine Brigade.
In 1856, he moved to Shelbyville, Missouri and was their teacher for two years. Again moving, Oscar went to Shelbisa, in the same county, and started a general merchandise business and remained there until he enlisted as a private in the 5th Battery of Cavalry in 1861, organizing at St. Joseph.
Promoted to 2nd Lieut. on September 1, 1861, and remained with the command until mustered out. Enlisting again as a private in the 13th Missouri Cavalry, but on the 19th of January was appointed captain, C Cav., in the Mississippi Marine Service by the President of the United States. In 1863, he was put in command of the U.S. Steamer BJ Adams, and the John Raine in 1864. He left the service honorably in April 1865, due to failure of eye sight (special ordinance No. 431), and after living in Omaha for a year, pursued agricultural life in Colfax county, Nebraska
I have data on much of the Miss Marine Brigade, Capt. Oscar Brown in command of Company C (Cavalry) the Baltic, along with 1st Lt. Samuel Carlisle and Lt. LeRoy Mayne (my relative). Lt. Mayne and Lt. McCune were lost the night of 8 April 1863 at Island 26 below New Madrid MO. I do have most of the rosters and some are on the Missouri Digital Data Base separated into their respective company elements, one roster for Infantry, one for Cavalry, and the other for Arty. You can contact me on email at email@example.com if you want more detail--Capt. Brown is buried not far from here in Eastern NE If you have the book by Crandall, History of the Ram Fleet, you can read about death of both officers on Page 271. Regards, Winfield Mayne