In this thread Fiveroptic (curse him for a thousand years!) introduced me to an entirely new form of procrastination. Behold - the wonders of Warehouse 23. Unfortunately, I’m not savvy enough to get all the obscure references.
For example:
Who’s Pakenham? Who’s A.J.? Is this from a book?
Perhaps if you can help me out, you’ll also post your own mystery for us to solve…
Thanks! 
Ten bucks says this turns into a Warehouse 23 thread instead of an obscure reference thread. I love, love that site.
Anyway, regarding your question…I don’t know much about the treaty of Ghent, but according to this scanned book on Google Books, the letter is ostensibly written by Andrew Jackson who defended New Orleans against British General Pakenham. Pakenham had not received news of the treaty and proceeded to attack, whereupon his forces were cut down in a ridiculously one-sided fight.
The Warehouse 23 item’s oddness (for all Warehouse 23 items are odd in some fashion) seems to lie in the fact that in reality Jackson probably didn’t know about the treaty, same as Pakenham, but the letter implies he had some advance notice and yet had been told to keep it under wraps.
A common thread in the Warehouse 23 stuff is that they often don’t come anywhere near to telling a full story, so why Jackson might have known about the treaty and why he might have ‘officially’ disavowed knowledge about it is up for speculation.
That might be a little dry, but explanations often are.
Of course, if I’d googled for ‘treaty ghent’ instead of ‘treat ghent’ I might’ve gotten more…Wiki has more information than I could’ve provided.
It’d be fine with me if it was a Warehouse 23 thread. There’s a lot on there that I just don’t get. Another one that mystifies me:
Golf? I got nothin’.