ILLINOIS CIVIL WAR records can be found at http://www.ilsos.gov/genealogy/

CUMPSTON, REUBEN PVT K 29 IL US INF METROPOLIS, MASSAC CO, IL
ILLINOIS CIVIL WAR DETAIL REPORT
 
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  Name CUMPSTON, REUBEN   Rank PVT Company K Unit 29 IL US INF
 
  Personal Characteristics
  Residence METROPOLIS, MASSAC CO, IL Age 24 Height 5' 10 Hair LIGHT Eyes BLUE Complexion LIGHT Marital Status N/A Occupation FARMER Nativity LAWRENCE CO, OH
 
  Service Record
  Joined When MAR 22, 1864 Joined Where NATCHEZ, MS
  Joined By Whom LT ARMSTRONG Period 3 YRS
  Muster In APR 4, 1864 Muster In Where NATCHEZ, MS
  Muster In By Whom N/A Muster Out N/A
  Muster Out Where N/A Muster Out By Whom N/A
  Remarks VETERAN MUSTERED OUT AUG 4, 1865