Thus says Yahweh: "For three transgressions of Damascus, yes, for four, I will not turn away its punishment; Because they have threshed Gilead with threshing instruments of iron;
"They have threshed Gilead with threshing instruments of iron ..." This happened in the Syrian war against Israel's land east of the Jordan during the reign of Jehu (2 Kings 10:32,33; 13:7).  "They even crushed the prisoners to pieces with iron threshing machines, according to a barbarous war custom that is met with elsewhere  (2 Samuel 12:31)."[19]