Lanefan
Victoria Rules
That's not the same, though. With the 1e version, instead of running out of damage you get a fresh damage roll each time you hit.Variant cleave rules would work best here.
After you reduce a target to 0, make attack roll vs one target withing reach, if attacks hits deal remaining damage to that target, if still is remaining damage, repeat.
If you're a 6th level Fighter surrounded by mooks you get 6 completely independent attacks* per round and a normal damage roll for each one that hits.
* - unless you run out of reachable foes first.