שופטים, פרק ד׳, פסוק י״ג

The mobilization of Sisera's army blends practical military strategy with hidden Divine guidance. From a tactical standpoint, Sisera relies heavily on the combat advantage of his chariots, assuming this powerful force will easily defeat any foot soldiers that stand against him [ביאור שטיינזלץ].

Despite these earthly calculations, the entire military maneuver is designed to fulfill God's plan. It is God who places the decision in Sisera's mind to mobilize his entire multitude of troops and chariots. Logically, a much smaller force would have been sufficient to handle the weak Israelite army, but the massive call to arms is a direct result of Divine intervention [מלבי״ם]. God orchestrates this vast gathering specifically to draw the enemy to a designated location.

Operating from his base in Harosheth-Hagoyim, Sisera orders his troops to march out and assemble at the Kishon River [רש״י]. This specific movement of forces perfectly fulfills God's earlier promise to draw the enemy army directly to the river [מלבי״ם].