Then a lot of folks did the 'impossible'.D&D itself didn't have the complete rules for combat. Players were referred to Chainmail man-to-man rules. It is impossible to learn how to run combat from just the original D&D set alone.
Easy-peas-y. What would be a bit difficult is deciding how to integrate the three different combat systems in Chainmail with the D&D rules set. It has been done in "modern" times, but I don't know of any actual attempt "back in the day". By all accounts I have encountered, even Arneson's proto-D&D dumped Chainmail pretty quickly (probably by the second or third session of dungeon expeditions).This system is based upon the defensive and offensive capabilities of the combatants; such things as speed, ferocity, and weaponry of the monsters attacking are subsumed in the matrixes. There are two charts, one for men versus men or monsters and one for monsters (including kobolds, goblins, orcs, etc.) versus men.
All attacks which score hits do 1-6 points damage unless otherwise noted.
The D&D FAQ from 1974-75 made clear that Chainmail was mainly meant for battles among non-fantastic types at a 1:10 or 1:20 model:man ratio. The 'alternative' rules in D&D were strongly recommended for all combats among individually depicted fantastic figures. As put in the dedication, "Here is something better!"
It might be close enough to impossible to learn from the OD&D booklets how to run combat just as in some later game -- but that's an absurdly anachronistic bar to raise!
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