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... nihil ex adrogantia remittere, quo minus iuventutem armarent, coniuges...

A result clause introduced by "quo minus": the earlier defeats of the Britanni did not cause them to lose their arrogance ("nihil ex adrogantia remittere"), with the result that or "but" (lit., " by which the less") they were arming the young men, they were transferring their wives, etc.