He left the army in 1865, after receiving the customary promotion to brevet rank of Major General of Volunteers in recognition of his faithful service to the Union.

Nevertheless, the presumed murder of Alsman was viewed as part of a pattern of extralegal behavior regarded by Porter's enemies as typical of his command, tolerated if not encouraged by the Rebel leader.

None of them had any connection with the disappearance of Alsman; Willis Baker was in the Palmyra jail because his sons were said to be riding with Colonel Porter.

Found innocent of rape but guilty of embezzlement, he was sentenced to prison and was released by General William Starke Rosecrans on the grounds of persecution and an unfair trial, even though his accuser was another Union officer.

[5] Strachan died in New Orleans Feb 10, 1866; he was buried in a tomb in a defunct cemetery and remains removed[6] According to James J. Fisher's column in the Kansas City Star (July 29, 1994) Andrew Alsman was observed alive September 16, 1862, in the company of two Confederate guerrillas, near Troublesome Creek (in the vicinity of Steffenville, MO).

Paul Davis, a journalist working for the Hannibal Courier-Post, recalls being shown a box matching this description and containing a skull said to be Alsman's by a Ralls County resident in the 1990s.

The Western Historical Manuscripts Collection at The University of Missouri-Columbia's Ellis Library has an "Account of finding skull believed to be that of Andrew Alsman.