The Sword was Used: Sometimes for Self-Destruction
Source: TTT
1 Samuel 31:4, 5
Then Saul said to his armor-bearer, “Draw your sword and run it through me, 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.
Acts 16:27
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.