Israel and Judah fight Moab
Israel, Judah and Edom fought against Moab. The king of Moab sacrificed his son and Israel withdrew.
Key passages
2 Ki 3:21–27

Now all of Moab had heard that the kings had come up to fight against them, and all who were fighting age and up were called up, and they stood at the border. When they arose early in the morning, the sun shone on the waters, and Moab saw the waters from the opposite side as red as blood. …