Verse 16
16. the trumpet—namely, of the besieging enemy (Amos 2:2).
alarm—the war shout [MAURER].
towers—literally, "angles"; for city walls used not to be built in a direct line, but with sinuous curves and angles, so that besiegers advancing might be assailed not only in front, but on both sides, caught as it were in a cul-de-sac; towers were built especially at the angles. So TACITUS describes the walls of Jerusalem [Histories, 5.11.7].
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