He appears in the CW Research Database, therefore, he must have file cards in the Compiled Service Records for Union Soldiers who served in Units from the state of Louisiana.

Alonzo P. Santini
Enlisted as a Private
Co. H, 1st Louisiana Cavalry

To find out more information on him, you need to review his records. One way is to obtain his records through a service provided on this message board. See:

http://history-sites.com/research/index.html

George Martin