Isaiah 19 is a continuation of the announcement of the LORD’S judgment upon Egypt.
An oracle concerning Egypt. Behold, the LORD is riding on a swift cloud and comes to Egypt; and the idols of Egypt will tremble at his presence, and the heart of the Egyptians will melt within them. (Isaiah 19:1 ESV)
All over Egypt we see evidence of the ancient fallen power. This fallen statue of Ramses II at Memphis illustrates what happened.
The princes (leaders) of Zoan, and other places in Egypt, are likened to pillars that were to be crushed. Columns, pillars, and statues are scattered over the ruins of ancient Zoan (Tanis) in the land of Goshen. In the photo below we see columns stacked up.
Those who are the pillars of the land will be crushed, and all who work for pay will be grieved. The princes of Zoan are utterly foolish; the wisest counselors of Pharaoh give stupid counsel. How can you say to Pharaoh, “I am a son of the wise, a son of ancient kings”? Where then are your wise men? Let them tell you that they might know what the LORD of hosts has purposed against Egypt. The princes of Zoan have become fools, and the princes of Memphis are deluded; those who are the cornerstones of her tribes have made Egypt stagger. (Isaiah 19:10-13 ESV)