The Sword was Used: Sometimes for Self-Destruction

Then Saul said to his armor-bearer, “Draw your sword and run me through with it, or these uncircumcised men will come and run me through and torture me!” But his armor-bearer was terrified and refused to do it. So Saul took his own sword and fell on it.

When his armor-bearer saw that Saul was dead, he too fell on his own sword and died with him.

When the jailer woke up and saw the prison doors open, he drew his sword and was about to kill himself, presuming that the prisoners had escaped.