Lynus Armstrong was apparently still around in 1860, it appears that he was elected captain of a volunteer militia company in December of that year.

1860 Dec 28. Independent Company Cavalry.
Lynus Armstrong, Captain.
Nathaniel C. Pryor, First Lieutenant.
Felix Ives Batson, Second Lieutenant.
John S. Houston, Third Lieutenant.
1861 May 24.
Austin C. Jacobs, First Lieutenant, vice Pryor resigned.
James Dyer Hardgrave, Second Lieutenant, vice Batson resigned.