Now therefore, behold, the Lord bringeth up upon them the waters of the river, strong and many, even the king of Assyria, and all his glory: and he shall come up over all his channels, and go over all his banks: Now therefore - for the reason given in Isaiah 8:6, the Assyrian flood, which is first to overflood Syria and Samaria, shall rise high enough to reach rebel Judah also (Isaiah 8:8).
Waters of the river. Euphrates, swollen in spring by the melting of the snow of the Armenian mountains (cf. Isaiah 8:6; Isaiah 7:20), is the symbol of the Assyrian power.
All his glory. Eastern kings travel with a gorgeous retinue.
He shall come up over all his channels. The Euphrates had channels, natural and artificial, in the level region, Mesopotamia.