The only George Knauf I find in Union CW records is that for George H. Knauf, Private/Corporal 51st Pennsylvania Inf.

M554: Index to Compiled Service Records of Volunteer Union Soldier Who Served in Organizations from the State of Pennsylvania

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The only Knapp found in rosters of the 10th Michigan Cavalry is:

Jonathan T. Knapp

Residence was not listed; 29 years old.
Enlisted on 10/21/1863 at Prairieville, MI as a Private.
On 10/30/1863 he mustered into "M" Co. MI 10th Cavalry
He deserted on 10/6/1864 at Strawberry Plains, TN

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However, the index to soldiers in the 10th includes this entry:

George Knapp, Private, 10th Michigan Cavalry

M545: Index To Compiled Service Records Of Volunteer Union Soldiers Who Served In Organizations From The State Of Michigan

This record is not on-line, however you can procure this record through a service provided by these message boards at:

http://history-sites.com/research/

………..

William Finkler

Residence was not listed; 23 years old.
Enlisted on 2/15/1865 at Grand Rapids, MI as a Private.
On 2/15/1865 he mustered into "C" Co. MI 10th Cavalry
He was Mustered Out on 11/11/1865 at Memphis, TN

Sources used by Historical Data Systems, Inc
- Record of Service of Michigan Volunteers 1861-65

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10th MI Cavalry
( 3-years )
Organized: Grand Rapids, MI on 11/18/63
Mustered Out: 11/11/65 at Memphis, TN

Officers Killed or Mortally Wounded: 2
Officers Died of Disease, Accidents, etc.: 0
Enlisted Men Killed or Mortally Wounded: 29
Enlisted Men Died of Disease, Accidents, etc.: 240
(Source: Fox, Regimental Losses)

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See also:

https://archive.org/details/chronologyof10th00kinn
http://www.suvcwmi.org/research.php
http://bentley.umich.edu/research/guides/civilwar/reghist.php