"The longest bareknuckle fight on record occurred in Melbourne, Australia, on October 19, 1856. James Kelly and Jack Smith fought for 6 hours 15 minutes. [1]"
"Modern Parallels
The development of these rules has since been mirrored in the evolution of modern 'No holds barred' competition into Mixed martial arts.
During the development of boxing, while some rules were added for the protection of the fighters, most rule changes such as the addition of gloves (which became thicker with time) were not added so much for the protection of the fighters, but rather to create more action in a typical fight.
In the bare-knuckle era, fighters were unable to throw as many full-force punches without risking damage to their hands. Therefore, after a couple of rounds, the punches tended to be less forceful. The addition of gloves meant that the fighters could throw more hard punches without injury.
Ironically, the addition of gloves to boxing made it a much more violent sport than without. Modern boxers frequently suffer head trauma due to the repeated full-impact punching that the gloves are able to offer.[3] Visually, mixed martial arts competitions may look more violent to the casual observer, with fights continuing on the ground, in truth it is actually safer for the competitors because the risk of head trauma from constant impacts is substantially lower[4]. This is demonstrated by the rarity of deaths and severe head trauma in regulated MMA competitions, while in boxing people die every year, and head trauma is a major concern, leading to physically debilitating illnesses such as Parkinson's Disease.
Although modern commercial mixed martial arts competitions use some form of gloves (thickly padded boxing type for most stand-up styles such as in K1 or a lighter fingerless version for those that include more grappling such as Pride or UFC), another modern parallel with full contact bare-knuckle fighting can be found in Kyokushin karate, which uses no gloves or body padding in its highest level tournaments. Kyokushin fights differ in that fist or elbow strikes to the head are no longer allowed, although all forms of kicks and knee strikes are permitted, including to the head."
"So, it's defeat for you, is it? Someday I must meet a similar fate..."