Arriving at the capital city of Amalek marks the beginning of a decisive campaign against the historic enemy of the Israelites. The encounter near the city leads to a fateful confrontation in a valley, a location that serves as the setting for both a physical battle and a profound moral struggle within the king.
The primary approach among commentators is that the events in the valley describe the actual outbreak of war. Alternatively, the strategy involved setting up an ambush in the valley ahead of the main attack [רד״ק]. The exact nature of this initial clash is debated. One perspective suggests that the Amalekites advanced to block access to the water, resulting in a preliminary fight for control over the water sources before the larger campaign began [אברבנאל]. Another view proposes that Saul deliberately chose to fight from the low ground of the valley. By defying standard military tactics that favor the high ground, he intended to prove to everyone that the victory over Amalek did not depend on military strength, but was a clear miracle from God [אהבת יהונתן]. A different explanation asserts that Saul initiated an artificial territorial dispute over the valley to create an acceptable diplomatic excuse to declare war. This action revealed a spiritual flaw, as he should have gone to battle relying entirely on God's Commandment, rather than seeking human justifications [מלבי״ם].
Alongside the military campaign, the events in the valley represent a deep internal conflict. Saul stood in the valley and debated with himself, drawing a legal comparison to the Commandment of the broken-necked heifer, which requires a ritual in a valley to atone for a single unsolved murder. He reasoned that if the Torah demands such strict atonement for one person, it is difficult to justify destroying an entire nation. He further questioned why the children and animals should be punished if the adults were the ones who sinned [רש״י]. This hesitation intensified because the Amalekites attempted to convert out of fear, leading Saul to believe that the command to destroy them was no longer valid [נחל שורק].
In response to this misplaced compassion, a heavenly voice rebuked him, warning him not to be overly righteous. He was told not to be more merciful than God, who had commanded the war. Saul only partially accepted this rebuke; he killed the people but spared King Agag and the best of the livestock [נחל שורק]. Ultimately, this distorted mercy toward Amalek transformed into terrible cruelty. Years later, Saul showed absolutely no pity when he completely destroyed the priestly city of Nob. At that moment, a heavenly voice called out to him once again, warning him not to be overly wicked [צאינה וראינה].