Jo here. I became curious about divorce in the Regency, which as we all know was both difficult and expensive and remembered the complicated Wellesley/Paget business, whereupon I stumbled across a duel. The report gives a clear picture of how a duel might go, but first we need the back story. It does become a little complicated!
In fact, she was married to one of Wellington’s brothers, Henry Wellesley, shown left, which made the whole thing even messier as Paget was a crack cavalry officer but the C-in-C wouldn't use him.
She left her husband to live with Paget, and then her brother, Captain Cadogan, called Paget out, presumably for bringing her into disrepute. Apparently her husband, unlike his brother, wasn't at all warlike. From his portrait he certainly looks peaceable.
Some duels were hasty and/or over trivialities with no intention of great harm, though with pistols one never knew. This one was serious and some observers went to pains to give a clear account of it.