Do you have a date of birth or death, or wife name or children's name, county of residence? Any tidbit will help lock down an identity better.
High probabilty match is William L. Ralph born 1829 Sumner TN, moved to Missouri 1851, married Mary E Yoast 1860, resided in Polk Co Missouri.
W.L Ralph reported as enlisting Co B 1st Regt Mo Inf Vol. at Memphis TN on July 1 1861, absent sick Feb 16th at Nashville TN.
If you don't know any of the above you can try to get a CSR (click on the ad banner at top of page!) to see if there is more identifying info in the service record, be sure and check for a pension application too.