Besides the marriage record on familysearch, that is the only source I can find. They were married 20-APR-1863 in Philadelphia.
Also marriage record located here (pg 216):
Would this be his son?
Here is text where Samuel Gamble a mentioned a few times. As our the Morrow's and Johnsons.
And another source:
SAMUEL GAMMEL (GAMBLE) Served as pvt., with Capt. Thos. Askey 1779- 80-81. He was of Fannett Twp., and his will prob., Feb. 1797. His wife was Elizabeth and he named sons Samuel; William; James. Daus., Jean Kennedy; Polly Morton; Shusana Elder; , Peggy Elder. Penna. Arch. 5th Ser. Vol. 6, p. 61, 393, 424.