Image via Wikipedia
In the latest files released by familysearch I found Elizabeth M CUMPSTON a widow of Veteran William H CUMPSTON of the 12 Illinois Infantry Company B Application no. WC30401
[Case Files of Approved Pension Applications of Widows and Other Dependents of Civil War Veterans, ca. 1861-ca. 1910 Record Group 15 ARC 300020]
I have a William H CUMPSTON on my website at http://www.cumpston.org.uk/#/william-h-cumpston-boone-co-i/4539297773 who was killed in the War and another of the same name at
http://www.cumpston.org.uk/#/william-h-cumpston-lucas-co/4539297678 who was mustered out. Do let me know if you recognise these people.
cumpstonresearch 
Pingback: Sidney Dewayne Cumpston sudden death Burgettstown PA | cumpstonresearch
Pingback: Searching for surnames | cumpstonresearch
Pingback: Cumpston website update | cumpstonresearch
Pingback: Frances W Cumpston Sacramento County, Elk Grove, California | cumpstonresearch
William H. Cumpston and his brother Albert R. Cumpston were both in Company B, 12th Illinois Volunteer Infantry during the Civil War. William was killed and Albert was badly wounded on February 15, 1862 at the Battle of Ft. Donelson. They were my 3rd great grand uncles. Brothers of my maternal 3rd great grandmother. I have Albert’s military and pension record.