Dyma ddiffiniad a geir yn Wikipedia:
In military or police operations, the rules of engagement (ROE) determine
when, where, and how force shall be used (for example, a Russian submarine
cannot open fire on American vessels without an official declaration of
war). Such rules are both general and specific, and there have been large
variations between cultures throughout history. The rules may be made
public, as in a martial law or curfew situation, but are typically only
fully known to the force that intends to use them
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