Adam Clarke on Amos 4:3

And ye shall go out at the breaches - Probably the metaphor is here kept up. They shall be caught by the hooks, or by the nets; and though they may make breaches in the latter by their flouncing when caught, they shall be taken out at these very breaches; and cast, not in the palace, but into a reservoir, to be kept awhile, and afterwards be taken out to be destroyed. Samaria itself is the net; your adversaries shall besiege it, and make breaches in its walls. At those breaches ye shall endeavor to make your escape, but ye shall be caught and led into captivity, where most of you shall be destroyed. See Houbigant on this passage.