At Fort Donelson, Heiman's Brigade, increased by the addition of the 42nd and 53rd Tennessee Regiments, was placed in Brigadier General Bushrod R. Johnson's Division, and as part of his division surrendered on February 16. Captain Joseph Love, in his account of the regiment in Lindsley's Annals, stated that the two companies which had been on guard duty in Kentucky, arrived at Fort Donelson Friday night, February 15, just in time to be included in the surrender the next day. He further stated that the baggage and clothing of the regiment were captured in the move from Fort Henry, and that when the regiment arrived at Fort Donelson, a detail was made up with men from each company to return home and collect clothing etc.; that measles having broken out in the regiment, it surrendered only 360 men.

The men who escaped capture at Fort Donelson were grouped into a detachment under Captain David R. Sowell, senior captain of the 48th, and ordered to Corinth, Mississippi. Here, on April 7, 1862, they were reorganized into a small battalion of four companies which, a few days later was consolidated with six companies from the 54th Tennessee Infantry Regiment plus some from other regiments who had also escaped capture at Donelson, to form the 48th (Nixon's) Tennessee Infantry Regiment.
http://www.tngenweb.org/civilwar/csainf/csa48v.html

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D. R. Sowell, Captain, Company B, 48th Tennessee Infantry (Nixon's), discharged June 28, 1862

M268: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Tennessee