שופטים, פרק ז׳, פסוק כ״ג

Following the initial defeat of the Midianites, the conflict enters a new phase of active pursuit. A massive crowd of Israelites quickly comes together, mobilized by a loud shout that serves as an urgent call to gather the people [מצודת ציון].

The men who respond to this call are from the tribes of Naphtali, Asher, and Manasseh. They are actually the same fighters who were dismissed earlier from the primary battle. They had remained nearby at Mount Gilead, waiting on standby for just such a moment. Once they hear that the Midianites are panicked and fleeing for their lives, they immediately regroup and join the chase to eliminate the enemy [רלב״ג, מלבי״ם, ביאור שטיינזלץ].

This responding force does not operate as a structured, organized army. Instead, it takes the form of a grassroots popular mobilization. The men rushing to the battlefield bring whatever they have on hand, wielding standard weapons or even simple farming tools to strike down the retreating Midianites [ביאור שטיינזלץ].