'Slaughter' in the Bible

Now it happened after the death of Saul, when David had returned from the slaughter of the Amalekites, that he stayed two days in Ziklag.

Behold, he has hidden himself [even] now in one of the ravines or in another place; and when some of your troops fall at the first attack, whoever hears about it will say, ‘There has been a defeat among the people who follow Absalom.’

The men of Israel [who supported Absalom] were defeated there by the men of David, and a great slaughter took place there that day, 20,000 men.