ELROD, J.R. Pvt
Enl 3Jul1861 at Benton, AR. Absent sick when the 11th was captured 8Apr1862 at Island 10, MO, present locality unknown. Was paid a clothing allowance 3Feb1863.
http://www.couchgenweb.com/civilwar/11thcob.html

Many of 11th Regiment were captured at Island Number 10. Pvt. Elrod was then assigned to Consolidated 11th and 17th Ark

ELROD, J.R. Pvt - Enl 13 Jul 1861 at Benton, AR. Absent at the capture of Island 10, present locality unknown. Paroled 13 May 1865 at Jackson, MS.
http://www.couchgenweb.com/civilwar/11_17coa.html

Looks like they lose him after February 1863, but he is listed as paroled (?)

Check the Couchgenweb.com site for histories of these regiments

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Happy Hunting!