When the messengers came to Gibeah of Saul, they reported the matter in the ears of the people, and all the people wept aloud.
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 came the messengers to Gibeah of Saul,.... Where he was born, and brought up, and now dwelt; and he being elected king, it brought an honour to the place; and from hence had this name, to distinguish it from the others, and this is the first time it was so called.
Then came the messengers to Gibeah - It does not appear that the people of Jabesh-gilead knew any thing of Saul's appointment to the kingdom, for the message is not directed to him but to the people. The people lifted up their voices and wept - They saw no hope of deliverance, and they expected that their reproach would be laid on all Israel.