So, what was Duck Lake Battle?
As mentioned, Duck Lake was the start of the 2nd Riel Rebellion (the Northwest Rebellion).
"Gentleman Joe" was... A bit of a character.
He started off in the family business as a Trapper/Trader for Hudson's Bay. His career there was cut a bit short after some whisky and a disagreement with his boss over the value of some furs he was bringing in, which led to him shooting his boss.
His boss lived, and the sketchiness of the whole thing (the boss had a bit of a nasty reputation of his own) led to him losing his job, but no charges laid.
Naturally, being an experienced bushman, and the fact he knew a number of native languages, led to him getting hired on by the NWMP as a scout/interpreter.
He was with the detachment that was looking for the Metis when the NWMP came across them at Duck Lake.
Joe rode forward with a few officers to meet up with some of the Metis elders in the middle of a field, with NWMP on one side, and a vastly superior number of Metis on the other.
Words were exchanged, things got heated... Joe shot one of the elders (who survived), and things went downhill from there. Our family history differs from the official history of exactly what led Joe to pull the trigger, so I'll refrain from going into details.
Anyway, Joe went on to have a reasonably long career with the Mounties, 20 years, and ended up being granted a decent parcel of land in Southern Saskatchewan when he retired (not far from Duck Lake, actually).
It was as a farmer that he earned the moniker "Gentleman Joe." He'd always aspired to being a gentleman farmer. So when he finally got his land, he faithfully worked his fields every day in black dress slacks and shoes, starched white shirt, black vest, tie, and top hat.
The locals started calling him "Gentleman Joe" as a result - they were probably twirling their index finger around their temples whenever they said it.