This is really confusing me. I just left a web-site that gave the captain of Co. H, 19th SC Inf as R.F. McCaslan. He was wounded as a lieutenant at Murfreesboro.
Senn is listed as captain with whom J.J. Ashcraft enlisted Nov. 1862 in Chester Dist. Could Senn have been but a recruiting officer sending the enlistees where they were needed?