the pen is mightier than the sword

fall on one's sword

To resign from a job or other position of responsibility, especially when pressured to do so.

flesh one's maiden sword

To experience or succeed in combat or struggle for the first time, as in the military or in politics.

pen picture

A written description, often biographical.

poison pen

A manner, means, or tone of expression had by a written work, characterized by spitefulness, defamation, and/or intimidation directed toward a person, organization, or point of view.

put pen to paper

To write something (especially using pen and ink).

put to the sword

To execute, especially by using a sword.

sheathe the sword

To end a battle; to make peace.

slip of the pen

A mistake in handwriting; (loosely) any minor error by the writer that made it into print, having not been caught by editors or proofreaders.