John Gill Commentary 2 Kings 17:5

"Then the king of Assyria came up throughout all the land, and went up to Samaria, and besieged it three years." — 2 Kings 17:5 (ASV)

Then the king of Assyria came up throughout all the land
Of Israel, there being none to oppose his march; Hoshea not daring to come out, and meet him and fight him:

and went up to Samaria, and besieged it three years ;
so long the city held out against him, see (2 Kings 18:9 2 Kings 18:10) .