Enlisted as a Private on 13 September 1861.
Enlisted in Company A, 4th Infantry Regiment California on 21 September 1861.
Mustered out on 13 October 1864 at Drum Barracks, CA.

Joshua S. Stevens appears on the roster as a member of the 4th California Infantry as a private in Company A and E. He mustered out as a private. another piece of evidence is a stone in the Sutter Cemetery stating J.S. Stevens Co. E 4th Ca Inf.

4th Regiment of Infantry, Company E:
Stephens, Joshua S.
Private
Enlisted at Sacramento, Cal. July 30, 1864
Mustered Aug. 5, 1864
Discharged at Presidio, S.F., Mar. 30, 1866, with Co.

Sources:
1) http://cagenweb.com/yuba/Civil%20War/4RI-E.htm
2) Denise Damm, bridges@otn.net
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When Joshua moved to California he made several land purchases near his father in Sutter Co.
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Sutter Co., CA (1868)
Mer Twp Rng Sec Doc Id Case No Authority Date
MD 015N 002E 15 2568 CACAAA 034914 Cash Sale 1868/12/01 STEVENS JOSHUA S
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Sutter Co., CA (1875)
Mer Twp Rng Sec Doc Id Case No Authority Date
MD 015N 002E 10 374 CACAAA 035045 Homestead 1875/03/05 STEVENS JOSHUA S
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The 1880 census finds Joshua and family in Tehamah Twp., Tehama Co., California (E.D. 144, p. 7)
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In 1880 Joshua was a farmer in Riceville, California.