Mike, the man who served in Harrell's battalion was a different William Davis. He was a Marion County man, born about 1833, who had previously served in Co. K, 27th Arkansas Infantry, got separated from his command, and was assigned to Harrell's 17th Battalion Arkansas Cavalry.

The only William Davis I have a record of who comes anywhere close to the man you inquired about served in Co. M, 4th Arkansas Cavalry, U.S. Volunteers. According to the regimental rolls, he was born c1828 in McMinn County, Tennessee. He enlisted at Fayetteville on February 28, 1864. It would have a fairly short journey from Johnson County to Fayetteville.