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That's the origin, yes. It's a general rule. With all the other things equal and simplified, you need 3:1 advantage to assure success, in tactical terms.
But in operational terms, you can achieve that ratio by better maneuvering and surprise. Or you don't even need it, since your troops are better. Or you just have more firepower. Or shitload of other things.
Groups of men murdering other men is a very complex affair.