The Hebrew clause in 2 Kings 3:27:
וַיְהִ֥י קֶצֶף־גָּדֹ֖ול עַל־יִשְׂרָאֵ֑ל
Is literally, "And there was great wrath upon Israel".
Note what we are NOT told: we are not told the origin of the wrath (who was angry with whom). Was it Moab that was angry or God, or someone else? There are essentially two possibilities:
- It was the wrath of Moab upon Israel (perhaps obviously??)
- It was the wrath of the men of the attacking armies that fell upon Israel because of the appalling act it had forced the king of Moab to perform. See the Cambridge Commentary, the Pulpit Commentary, Benson, Barnes, Matthew Poole and Gill
- It was the wrath of God upon Israel - this is the usual use of the word translated "wrath", eg, 2 Chron 19:10, 24:18. See Jamieson-Fausset-Brown Bible Commentary
- It was the wrath of Chemosh upon Israel (see Ellicott), ie, the men feared Chemosh's wrath because of the sacrifice of the King of Moab.
In any case, the juxtaposition of the appalling act of the king of Moab sacrificing his son on the wall appears to be the cause of the wrath.
It is apparent that the commentaries are far from united on this matter - what was the origin of the wrath. I presume that in a large coalition (three kings and their forces) that the ideas were equally far from uniform and people had mixed feelings. The differences between the above options were often quite blurred in the minds of the ancients and it may have been a mixture of all four.
In any case, the purpose of the expedition was not plunder but submission - the coalition of armies was to remedy the rebellion of Moab (2 Kings 3:5) and thus to reinstate the regular tribute (2 Kings 3:4). No plunder was sought and no plunder was taken.