I don't know if you know the Philippine's national hero, Dr. Jose Rizal.

He prove this claim that Pen is Mightier than the Sword

He fights the Spaniards (in her era) using his pen, publishing books and novels was his way to fight those spaniards.

He became a really big threat to the Spaniard community that time and was sentenced to death.

If a person knows something bad about you, you make that person silent - ending up killing Jose Rizal, however because of his pen many persons manage to know something bad and lit a fire for the great change in Philippine history

There are also persons who chooses to fight using a pen. Martin Luther and Mahatma Gandhi