jgsugden
Legend
You're really not seeing this as it is. Do the simulation I suggested. In 5E, this is almost a guaranteed win for the solo orc....Orcs and hobgoblins even in idiocy would not attempt this even against commoners if they are just 1-2 HD. Orcs only have 13 AC.
Outnumbered 4 to 1 is still way to risky. High chance of death.
Some burly bloodlusted raider and slayer. Only 2 HD.
Rd 1: Orc throws a javelin at the commoners from somewhere outside the light ring of the fire. It has both advantage and disadvantage - so just an 80% chance of a kill. Let's say this is the miss and his next 4 attacks hit. Let's also say he only brought one javelin, so he needs to use his axe on the rest.
Rd 2: The commoners grab their clubs and torches and race off to attack the unknown attacking force. They double move - and don't reach him. He charges in and melee attacks one of the commoners. We're down to 3 commoners now as any hit is a kill - and they're all engaged in melee combat.
Rd 3: Commoners get to go and surround the orc. They attack at +2 for d4 damage. They need an 11 to hit, so a 50% chance. Let's say they get 2 hits for 5 damage. Orc is down to 10 hps - when it gets his second kill.
Rd 4: Commoners continue the attack and get another hit for 3 damage. Then the orc gets another kill.
Rd 5: The last commoner gets lucky and deals 3 more damage. The orc took more damage than expected due to bad luck, but still has 4 hps. That is when he kills the last commoner.
That sounds like something out of a Friday the 13th movie. The stranger charges in out of the night and hacks up a family of 4 in less than 30 seconds.
Orcs are terrifying when you consider what a commoner is. It takes fledgling heroes to have a chance to stand up against them - and I'll tell you right now, if you play LMoP a few times, it is not uncommon to have a few PC graves dug on Wyvern Tor.