The Mandalorian warriors are one of the few non-Force-sensitive entities with the prestige of ever emerging victorious against Force users, namely the Jedi Order, in a formal battle. The successful storming of the Jedi Temple and the seizure of the Darksaber as a trophy is their crowning glory. They pride themselves in this and thus do not fear nor submit to the Jedi like others do, seeing themselves as superior.
The Sith are a different beast altogether but are Force-users all the same. Given the Mandalorian warrior culture their history of victories against trained Force users, it seems unlikely that they would not see the Sith as fair game. They might in fact perceive them as the greater challenge and thus an even greater glory to triumph over in battle.
So, have the Mandalorians ever fought with the pre-Banite Sith at any point in history, back when they were more numerous and organised as an Order? If yes, how did they fare? Any notable successes?