The opening of the narrative captures a dramatic transition between two eras of leadership, sharply contrasting the fates of two kings. The period following Saul's death is not merely a chronological detail, but a reflection of his setting sun and the overwhelming weakness of the Israelites, who had just been struck down by their enemies.
At the exact moment Saul's reign ends in darkness, David's power begins to rise. He returns from striking down Amalek, having defeated a massive enemy camp with a small force of only four hundred men [מלבי״ם]. His return from battle is a complete triumph, as he successfully recovers all the captives and spoils that the Amalekites had previously taken [ביאור שטיינזלץ].
As David settles back in the city of Ziklag, the temporary quiet serves as the backdrop for the devastating news that is about to reach him. This setting prepares the ground for the tragic report of the military collapse, the panicked flight of the people, and the ultimate deaths of Saul and Jonathan, who fell in battle together, inseparable to the very end [אברבנאל].