"It is a very large gun, with a 10 - inch muzzle and was made by the British for navy warfare. In 1812 it was captured from the British and taken to New Orleans"

I am 99.99% certain no 10-inch gun was in British service in 1812. The largest contemporary British weapons were 13-in and 10-in mortars and 68-pdr carronades, 8.12-in caliber. The largest contemporary British true guns were 42-pdr (7-in) that BTW had been retired from ship service, because too unwieldy. I believe no Royal Navy true gun larger than a 32-pdr (6.40-in) could have been captured in action in 1812, and no true gun larger than a tiny 18-pdr was actually taken.

AFAIK the first 10-in gun (an experimental British one) appeared in 1824 [#1], after Paixhans' developments had made such a weapon useful. The first operative models appeared only in 1842, both in Britain [#2] and USA [#3].
[#1] Robert Gardiner (ed.), The Line of Battle: The Sailing Warship 1650-1840, Conway 1992, p.154
[#2] Howard Douglas, A Treatise on Naval Gunnery, 5th revised edition, London 1860, p.171
[#3] Edwin Olmstead, Wayne E. Stark & Spencer C. Tucker, The Big Guns: Siege, Seacoast and Naval Cannon, 1997, p.61

P.S. Of course we all know journalists, don't we?

PP.S. The colloquial term "Columbiads" applied to such weapons does not mean that "...they were proudly called Columbiads after the name of the Federal District, because only across the Atlantic did one normally dare to cast such a powerful piece...", as I found on one source, but it is more prosaically related to Columbia Foundry, Georgetown D.C., which produced most of the first batches.