being forced to pass under the yoke was the most humiliating thing a roman army would be forced to do in the republican period, you can consider it like losing an eagle in later eras. look up the caudine forks, or the losses in the jugurthine war initially if you want to learn more about it. really this trait could be for more than romans actually. But yes, it will have to do with a roman general suffering a humiliating defeat or the routing of his army or something along those lines.
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