Judges 11:28

‘ However, the king of the children of Ammon did not listen to the words of Jephthah which he sent him.'

That is, the king did not admit that he was in the wrong and return to Ammon. No one would have been more surprised than Jephthah if he had. It was not likely that he would easily relinquish the tribute that they had been receiving for so long. But Jephthah had made the impact that he wanted to make, both on his own troops and on the enemy, and, he trusted, on Yahweh. He had declared his faith and dependence on Him. Now he looked for Yahweh to respond. And He did.