I nearly finished a document of about ten pages on mass combat in OSR systems.
My idea, as I had already discussed a few times, was not to introduce a new/alternate system (Chainmail, Warmachine, etc.) new types of data, replace the d20 with a d6, or rewrite a troop list, but to simply to use the rules/stats as they are written in systems like B/X or AD&D, and extrapolate those rules to cover a much larger group of creatures at once, or to cover a longer period of time. In other words, to try to summarize several rolls into a single one.
I approached this issue through four paths: one versus one, which I thought could simply be ignored; one versus many, allowing powerful characters to attack many weak enemies at once; many versus one, which allows the opposite; and many versus many, which are rules for battles between groups of different sizes against each other.
In the end, I decided to add a small idea about how to resolve any combat with just a single roll. Ultimately, I am concerned that this idea may have made all my other ideas obsolete, since it solves almost any situation. The only caveat is that the combats must be between creatures of approximate power. If you avoid absurd situations like a thousand versus one, it should work in situations up to fifty versus twenty, one versus ten, and so on.
Here are some ideas that might give you the gist of it. And maybe this is already enough that the doc is not needed... But let me know if it sounds interesting.
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The margin of success
When you make an attack roll, subtract the target number from your result. That difference — positive or negative — is your margin, and it is added directly to damage on a hit. Optionally, a miss works the same way in reverse: a near-miss deals reduced damage rather than nothing, meaning every roll moves the fight forward.
A fighter needs a 10 to hit and rolls a 14. Margin: +4. His sword deals 1d8 — say he rolls a 5 — for a total of 9 damage. If he had rolled a 7 instead, missing by 3, the optional rule gives him 1d8 minus 3 — perhaps 2 damage — a glancing blow that still counts.
The group attack bonus
Ten bandits attacking a single knight roll once, with a +10 bonus, and deal one die of damage plus the margin. No rolling ten separate attacks. One roll, one result.
Conversely, the knight can attack all ten in a single attack with a -10 penalty. If he hits, he damages ALL ten bandits at once (10 is the hard limit; the knight cannot attack 100 at once).
The bandits need a 12 to hit the knight and roll a 9, adjusted to 19 with their +10 bonus. Margin: +7. They deal 1d8+7. The knight is not struck ten times; he is overwhelmed by a sustained press whose worst moment is captured in that single roll.
The knight strikes back. He needs an 8 to hit a bandit and rolls a 14, but with a -10 penalty that becomes a 4. A miss. The bandits' formation holds for now. Next round he rolls an 18, adjusted to 8. He hits, margin 0, deals 1d8 damage with his sword. If the bandits only had 4 HP each and he rolls 5 damage, he might have cut down all ten at once.
Groups of different sizes
When two groups of different sizes fight each other, the larger group gets a bonus and the smaller group gets a penalty, equal to the difference in size. Seven bandits against five knights: the bandits attack with +2, the knights with -2.
In some cases the groups can be reduced to a common denominator. Six bandits against four knights can be treated as three bandits against two knights, keeping the same proportions with fewer units to track. Twelve against eight becomes three against two. This is purely a matter of convenience — the math is identical either way.
The single roll method (optional)
Both sides roll one attack each, simultaneously. Apply the margin to average damage. Compare remaining HP. The side with more left wins; the loser drops to zero; the winner keeps only their remainder. Two rolls, a subtraction, a comparison, done.
Two ogres, 19 HP each, average damage 6, needing a 10 to hit. Ogre A rolls 16, margin +6, deals 12 damage, leaving Ogre B with 7 HP. Ogre B rolls 9, margin -1, deals 5 damage, leaving Ogre A with 14 HP. Ogre A wins. Subtract: 14 minus 7 = 7 HP remaining. Bloodied but standing.
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Obviously this is intended for NPC fights and mass combat, mostly. Most players do not want their PCs to be killed in a single roll, and that can absolutely happen here. But it can be used in a limited way even for PCs: if your fighter is attacked by a mob of goblins that could never realistically kill him, a single roll quickly tells you how much damage he sustains before cutting through them, and everyone moves on.
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