דברי הימים ב, פרק י״ג, פסוק י״ד

Trapped on the battlefield, the men of Judah face an immediate crisis as enemy warriors close in on them from both the front and the rear [מצודת דוד, ביאור שטיינזלץ]. In response to this severe distress, they take coordinated action.

They cry out with a plea carefully composed to awaken divine mercy and bring about salvation. This appeal relies on three core elements: a direct prayer to God, the active presence of the priests, and the sounding of an alarm. The priests blast this alarm to signal their distress [מצודת דוד, ביאור שטיינזלץ]. Even though the act of sounding an alarm naturally implies the instrument used, trumpets are explicitly utilized to emphasize the urgency of the moment [מצודת דוד].

Ultimately, it is this powerful combination of sincere prayer, priestly involvement, and the blast of the trumpets that leads to their victory through the power of God [מלבי״ם].