Joshua's military campaign swept across a vast geographical landscape, establishing new borders of control throughout the southern region and the hill country. The heavy blow he delivered to the enemy forces refers specifically to the victories achieved during this current military operation [מלבי״ם].
The conquest established a firm southern boundary for the Land of Israel. Stretching from east to west, the route from Kadesh Barnea to Gaza marked the edge of the territory that would belong to the tribe of Judah [רש״י, מלבי״ם]. However, this southern victory was not entirely complete. The stretch of land sitting west of Gaza, reaching all the way to the sea coast, remained untouched during this phase and was left under the control of its original inhabitants [רש״י].
As the military advance pushed forward, the forces captured the land of Goshen. This was not the well-known region of Goshen located in Egypt, but rather a distinct mountainous area situated squarely within the territory of Judah [רד״ק, מלבי״ם]. From these rugged highlands, the campaign continued its northern push, finally reaching Gibeon, a region that falls within the established borders of the tribe of Benjamin [מלבי״ם].