Hi David - I'm going out on a limb here to make a guess at the identity of the cannon in the old photo. Could it be one of the two 3 inch ordnance rifles captured at Mansfield La. and given to the Val Verde Battery of Texas. Here is my reasoning: Most cannons were confiscated by the Federal government at the end of the war. However, the two Val Verde Battery 3 inch ordnance rifles were buried near Fairfield Tx. until the 1880's, when they dug up and put on display. One gun is on the Freestone County Courthouse grounds in Fairfield, Tx. and the other is at the Confederate Reunion Grounds near Mexia, Tx. I realize that the Pelican Battery had a section of 3 inch Parrot rifles and not 3 inch ordnance rifles, but the actual type of cannon is obscured by the veterans bodies in the old photo. The Pelican Battery and the Val Verde Battery fought together in many of the same battles and campaigns and could have also have joined together at reunions.