Re: GURPS Mass Combat Question
To quibble, that's 3rd edition, not 4e. That article was published in 1993, about a decade before 4e came out, and was essentially duplicating rules in even earlier books. 4e's mass combat rules are published in GURPS Mass Combat.
As to the substantive question, I don't know, but I suspect that's a convenience for the players and GM should parts of a larger force have to go off and fight on their own.
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