“ Then Balak the son of Zippor, the king of Moab, arose, and fought against Israel, and he sent and called Balaam the son of Beor to curse you. But I would not listen to Balaam, therefore he blessed you still, so I delivered you out of his hand.”
Then the King of Moab came against Israel to ‘fight' with them (Numbers 22:11), but he used different weapons. He called in Balaam, the son of Beor, a famous seer. Many would have considered him more of a threat than all the other armies put together. But even Balaam was subject to YHWH, and when he began to attempt a curse on Israel YHWH refused to listen to him (Deuteronomy 23:5) with the result that Balaam blessed Israel. (Note the implication that there was no god known to Balaam who could do anything about it). Thus were they delivered from the hand of Balaam and from the hand of Moab. Whether any actual fighting took place we were not told in Numbers, but there may well have been. However the gathering of his army by the King of Moab and the ‘assault' through the activities of Balaam may well have been seen as ‘fighting'.