Thanks for the response. Here is a chronology of the "Captain's" life with civil war yrs. unknown.

John Riley Thompson
b. 4-13-1837 New Hope, Hurricane, Lincoln Co., MO
1-12-1858 to 10-4-1859 served as postmaster @ New Hope, Lincoln, MO.
6-6-1860 Benton, LaFayette, WI staying hotel, occupation lead minor. Damrons migrated from Lincoln co. 1846 to Benton

WI.Damrons operated hotel. By 3-15-1860 Damrons migrated to Caledonia, Houston, MN.
8-6-1860 New Hope, Lincoln, MO farmer listed under father Jesse Thompson household.
9-24-1860 Marries Margaret E. Damron in Benton, LaFayette, WI occupation clerk.
Oct. 1861 In Missouri first child born.
9-8-1862 A brother deserts from 3rd MO Cav.St.Militia Co. A, near Mexico MO
Jan. 1866 second child born in Caledonia, Houston, MN
1867 third child born in MN
1870 Caledonia, Houston, MN occupation drives steam,wholesale grocer. Neighbor to Damron in laws.
1877 Migrates to Sioux City, Iowa
1880's Sioux City, Iowa occupation travelling salesman, teamster
1891-1896 Migrates back to New Hope,Lincoln Co., MO
1900 moves to Louisville, MO occupation wood dealer
8-18-19o6 wife dies Pike CO., MO
1910 moves to Indian Twp, Pike, MO occupation boatman
11-12-1910 marries second wife (33yrs. younger)listed as Captain JR Thompson on marriage certificate Louisiana Baptist Church
1912 moves to California
12-4-1920 dies LosAngeles, CA
12-13-1920 buried Elsberry, Lincoln, MO. Elsberry obit. mentions nothing of military service

In every record he is listed with John R or J R never simply John
I find cousins, in laws, brother from Pike, Lincoln Co. listed under Price CSA and also USA 37 EMM, 3rd MO
Cav.St.Militia.
I looked @ Dalby, John. Minnesota Civil War Soldiers, http://www.wisconsinhistory.org/roster/, Pike Home Guards, 5th
Faggs St Mil., 10 st. Militia Cav.,3rd MO Cav.St.Militia, 37th EMM, 49th EMM, 33rd Inf, 32 Inf., 1st and 2nd PEMM,
39th Inf, 49 Inf. and find no match with J, JR, Jno, John, John R.

The closest match was corp. John Thompson in Faggs 5th Co. G age 25 (off 1yr) but there is also a John Thompson b1836 PA
living in Lincoln, CO that matches him better because no middle init., and there is a brother of this John
Thompson PA that enrolled on same date and same company, plus matches age. There was also a captain John Thompson from Houston Co. MN but he was already on the 1857 state census born in Canada. I didnt look @ WI soldiers closely since his inlaws move to MN in 1860 and there was no John R Thompson. However there were 7 John Thompson's but none ranked above corp.

There are 2 biographies of a son written 50 and 90 yrs. in IL after the CW, in which I found errors or embellishments (like cousin to Allen Thurmond VP candidate, personally knowing Buffalo Bill Cody, Mark Twain, and O Henry. Thus I dont put
much credit towards him having "served in US army as a captain of a. company which he raised for the service".
However, I want to prove or disprove it. thanks