Albert Barnes Commentary 1 Kings 16:27

"Now the rest of the acts of Omri which he did, and his might that he showed, are they not written in the book of the chronicles of the kings of Israel?" — 1 Kings 16:27 (ASV)

His might - Perhaps this refers to the war between Israel and Syria of Damascus during the reign of Omri (1 Kings 20:1 and following). Its outcome was very disadvantageous to him (1 Kings 20:34; 1 Kings 22:2).