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Source: https://writers.stackexchange.com/a/33134
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

Source: https://writers.stackexchange.com/a/33134
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

### In general, no

In German medieval times, it sounds unlikely that a princess, i.e. the daughter of a living king, would be able to join the army in any credible manner. The main reason is that she would not have the authority to partake such a decision, nor she would be considered able in terms of fighting, or commanding. Remember that soldiers or aristocratic extractions in medieval times were far more trained than professionals: they trained their entire life. The other soldiers were akin to random fodder.

### Maybe in some special situations

If the king were to die, and there were no other heirs, and the woman in question were old enough, then the situation would be different. Depending on the country, the princess may become ruler, hence she would have access, for instance, to a commanding role in the army.

Another special situation, as suggested in other answers, would be to follow the path of Jean D'Arc.

### A real life example of a successful Margrave from the Dark Ages

Finally, for the very special "one-of-a-kind", I suggest giving a read to the life of [Matilda of Tuscany](https://en.wikipedia.org/wiki/Matilda_of_Tuscany), who not only lived during the time of German middle ages, but managed to crush the military dreams of the German King, Henry IV.

Original score: 2