Cathy, Thank you for posting your information about this family.For the past couple years, I have been gathering information on Wiggintons (any spelling) who fought on either side of the Civil War.My list currently numbers around 140 men.Four of these men were in the info you listed.You may have some of this information already so forgive me if this is repetitive.
Calvin D. was buried in the Clarksville TN Confederate Hospital Cemetery which was the Clarksville Female Academy.In the 1890's some remains were exposed during a landslide and these soldiers were reburied at the present-day Clarksville Riverview Cemetery.Those remaining as well as those re-interred were unidentified so it is unknown where his remains may actually be located.He was with the 1st MS Infantry, Co. H and was a Private.
William Harvey is buried at Gray Rock Cemetery in Franklin Co. TX as you said.He was with the 2nd MS Cavalry (also called the 4th or 42nd).He enlisted on 8/27/62.
John Tillmon was a Private with the 3rd Battalion MS Cavalry.There are some really neat pictures of him on findagrave.com.He is buried in Liberty Grove Cemetery in Tremont, in Itawamba Co. MS.
John (the father) was with the 1st MS Infantry.He enlisted on the same day as Calvin - 6/24/61 in Hampton MS and died after 26 days of service.
Those are some of the highlights that I have been able to come up with on these men but would love to hear what you have and if you have anything that contradicts this, please let me know.Also if you have any pictures or other materials that pertain to their service during the war, I would love to receive a scan of it if possible.