John Trapp on Isaiah 33:21

Ver. 21. But there the glorious Lord will be] The Church muſt needs be invincible, becauſe the glorious Lord is her Champion, or will do gallantly for us, as the words may be rendered. Her name is Jehovah-Shammah, Ezek. 48.35. The Lord is there, and how many reckon we him at? He alone is a potent Army, Iſa. 52.12.

A place of broad rivers and Streams] Such as Meſopotamia was, or the Garden of God. Or, he ſhall be inſtead of broad rivers, &c. even a river that ſhall not be drawn dry or ſucked out (as Euphrates was by Cyrus when he took Babylon) a river that ſhall not fail the dwellers by (as Nilus, once at leaſt, did Egypt, for nine years together; Ovid Art. l. 1.Creditur Aegyptus caruiſſe juvantibus arva Imbribus; atque annis ſicca fuiſſe novem) But ſhall fill its banks and ſhores perpetually, and keep a full ſtock of ſtreams and waters.

Wherein ſhall go no gally — nor gallant ſhip] i. e. None of the enemies navies ſhall annoy it. England had the experience of this in that famous 88. when the Seas were turreted with ſuch a Navy of Ships, as her ſwelling waves could hardly be ſeen: and the Flags, Streamers and Enſignes ſo ſpred in the wind, that they ſeemed to darken even the Sun: but the glorious God defeated them.