Isaac Sawyer
Illinois Civil War Muster and Descriptive Rolls Database (Illinois State Archives):
      
American Civil War Soldiers (ancestry.com)
       Isaac Sawyer - Pvt - Co 4 - 4th Cavalry Regiment Indiand
       Residence, Michigan City, Indiana; Enlisted, 09August1862
       Promoted to Full Corporal
       Mustered out, 29 June 1865 in Edgefield, TN
Civil War Soldiers & Sailors System Search Detail (National Park Service):
        
National Graves Registration Database (Sons of Union Veterans of the Civil War):
       Sawyer, Isaac - 4 Indiana Cavalry
       Died, 03Apr1886; Buried, Oakwood [Joliet] Will County, Illinois
Honor Roll of Stat of Illinois, Illinois Veteran's Commission, Oct 1, 1956:
       Sawyer, Isaac - Pvt - Co E - 4 IN Cav
       Died, 03Apr1886; Buried, Oakwood, Joliet, Will County, Illinois, Section 3
Will County Illinois USGenWeb Necrologist Reports (© 2002 The ILGenWeb Project All Rights Reserved):

Headstone Reading, Oakwood Cemetery, Joliet, Will County, Illinois:
      Isaac Sawyer
     
d. Aug 3, 1886 aged 57 yrs
         (G.A.R. marker)
        

Published Obituaries:

Additional Biographical Material:
   Isaac Sawyer - 4th Indiana Cav. - member of Bartleson Post No. 6, G.A.R. (organized 22 October 1882)
Souvenir of Settlement and Progress of Will County, Ill; HIstorical Publishing Co., 1884