David subdues Edom
The Israelites defeated the Edomites at the Valley of Salt and put garrisons in Edom.
Key passages
2 Sa 8:13–14

So David made a name for himself when he returned from defeating Aram in the Valley of Salt, eighteen thousand. He put garrisons in Edom; all over Edom he put garrisons, and all of Edom became servants of David. Yahweh protected David wherever he went.

1 Ch 18:12–13

And Abishai son of Zeruiah defeated eighteen thousand of Edom in the Valley of Salt. And he put garrisons in Edom, and all Edom became servants to David. And Yahweh delivered David wherever he went.