Then Nahash the Ammonite went up and besieged Jabesh-gilead, and all the men of Jabesh said to Nahash, “Make a treaty with us, and we will serve you.”
The Ammonites were bad neighbours to those tribes of Israel that lay next them, though descendants from just Lot, and, for that reason, dealt civilly with by Israel. See Deu 2:19. Jephthah, in his time, had humbled them, but now the sin of Israel had put them into a capacity to make head again, and avenge that quarrel.
Commenting on 1 Samuel 11:1-4
Then Nahash the Ammonite came up, and encamped against Jabeshgilead,.... A month after, as in the Septuagint and Vulgate Latin versions, that is, a month after Saul was chosen king; so Josephus (p): this prince was preparing for war against Israel before, which they hearing of, requested they might have a king to go before them in battle, Sa1 12:12 but now he actually marched...
Then Nahash the Ammonite came up, and encamped against Jabeshgilead: and all the men of Jabesh said unto Nahash, Make a covenant with us, and we will serve thee. (a) After that Saul was chosen king: for fear of whom they asked a king, as in .