Isa 26:1-21. Song of praise of Israel after being restored to their own land.
As the overthrow of the apostate faction is described in the twenty-fifth chapter, so the peace of the faithful is here described under the image of a well-fortified city.
strong city - Jerusalem, strong in Jehovah’s protection: type of the new Jerusalem (Psa 48:1-3), contrasted with the overthrow of the ungodly foe (Isa 26:4-7, Isa 26:12-14; Rev 22:2, Rev 22:10-12, etc.).
salvation ... walls - (Isa 60:18; Jer 3:23; Zec 2:5). Maurer translates, “Jehovah makes His help serve as walls” (Isa 33:20, Isa 33:21, etc.).
bulwarks - the trench with the antemural earthworks exterior to the wall.