I beat the 'The Way Of The Fighter' mission in Way Of The Samurai 4.
In order to understand just how much this means to me, I've been playing on hard, this means enemy health and damage has been ramped up, alongside some small difficulty changes throughout the game, in this mission specifically you have to kill these bodyguards and collect five treasures that they drop, these drops are not guaranteed, however, and you can't leave the fight once you've started it, your character does not automatically pick up these items either, so you have to kick them, potentially leaving you vulnerable to the enemy attacker.
This seems bad enough, until it turns out that there aren't just five bodyguards, there's dozens, each of which deal enough damage to instantly kill you with their special, these specials are highly telegraphed and easy to avoid, but if you flub a swing, miss the dodge timing, misjudge the attack distance, or even just be distracted by the ten-twenty other enemies surrounding you at all times, then you will likely be hit, some of their stances can even have their special be fast enough to stagger your guard, then begin another special and kill you that way with no way out, and their standard attacks still do significant damage anyway.
I think they're infinitely spawning, too, I wouldn't know, I didn't kill enough of them, the one saving grace I found is that newly spawned bodyguards have significantly less health, but they only needed to get lucky once, and they did, several times, but I beat them eventually, with gratuitous cheese, damage boosting items, and some luck of my own.