There's a Royal Family connection to Mobile's carronade. The commander of the HMS Carron which fought with the HMS Hermes at Fort Boyer was commanded by Captain the Honourable Sir Robert Cavendish Spencer, R.N., second son of the Second Earl Spencer. Diana, the Princess of Wales, was a Spencer and the daughter of the Eighth Earl so both Prince William and Prince Harry are collateral descendants(great nephews) of Captain Spencer.  https://en.wikipedia.org/wiki/HMS_Hermes_(1811)

 Captain Spencer commanded the HMS Carron during the 1st Battle of Ft. Bowyer, He commanded  the seamen landed during the 2nd Battle of Ft.Bowyer. He was the spy and scout who discovered the route from Lake Borgne to the Mississippi River for the British and he was in charge of taking the fugitive slaves from Dauphin Island and Apalachicola to the Bahamas, Nova Scotia and Trinidad.

In the chapel of the Spencer family in the Church of St. Mary the Virgin at Great Brington, Northampshire, England, there is a marble bust of Captain Spencer.

For a detailed description of Captain Spencer's activities during the British Expeditionary Force's Gulf Campaign, click on the following link. http://www.historiaobscura.com/the-spy-who-led-the-british-to-the-back-door-of-new-orleans-in-1814/