1. Isaiah 17:3 (ESV)
  2. Exposition

What is the fortress that will disappear from Ephraim?

Isaiah 17:3 (ESV)

3 The fortress will disappear from Ephraim, and the kingdom from Damascus; and the remnant of Syria will be like the glory of the children of Israel,declares the LORD of hosts.

The fortress probably refers to the city of Samaria, which the Assyrians would attack.