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I would take my cue from the (handful of) real women that joined armies. Most of them do it to save their countries, not for fun. She wasn't exactly a "princess," but Joan of Arc was a medieval gi...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/32307 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would take my cue from the (handful of) real women that joined armies. Most of them do it to save their countries, not for fun. She wasn't exactly a "princess," but [Joan of Arc](https://en.wikipedia.org/wiki/Joan_of_Arc) was a medieval girl who joined the French army, and (for a time) became its leading general. In real life! The reason this could happen was because she gained the ear of the king through her prophetic ability. A princess (by definition) would have her father as the king, and could gain the king's ear that way. Queen Elizabeth I (formerly a princess) took personal command of her army at [Tillsbury,](https://en.wikipedia.org/wiki/Speech_to_the_Troops_at_Tilbury) when the Spanish Armada threatened an invasion of England.