A sharp shift occurs between spiritual decline and miraculous salvation, revealing a defenseless nation facing an existential threat within its own borders. The primary approach among commentators is that this crisis was born from idolatry. When the Israelites chose to worship new idols, the immediate consequence was war reaching the very gates of their towns. Terrified by the enemy, the people were forced to lock themselves inside [רש״י, מצודת דוד, רלב״ג, רד״ק, ביאור שטיינזלץ, אברבנאל].
However, other perspectives suggest a different dynamic at play. Rather than a punishment, drawing the enemy to the city gates was a deliberate divine tactic. God chose new, miraculous methods to save Israel, knowing that the people would fight with far greater courage when directly defending their homes and families [רלב״ג, אברבנאל]. Another view explains that God had to select a completely new group of fighters for this campaign. The historic vanguard of forty thousand troops, who were accustomed to fighting in open fields, simply did not appear for this defensive battle over the cities [מלבי״ם].
Regardless of who marched into battle, the fighters stepped onto the battlefield entirely unarmed. Among a massive military force of forty thousand men, not a single shield or spear could be found [רלב״ג, רד״ק, ביאור שטיינזלץ]. This severe lack of basic combat gear was completely intentional, designed to magnify the scale of the miracle. Victory was not secured through physical might, but because God fought on their behalf and struck down the overwhelming enemy forces [רש״י]. Some commentators view this unarmed march as a high point of faith, comparing it to the era of Joshua. Just as forty thousand troops once crossed the Jordan River and conquered cities like Jericho through pure miracles without needing their weapons, this generation too experienced divine triumph without raising a sword [מצודת דוד, רד״ק].
A final layer of interpretation elevates the entire conflict into the spiritual realm, describing the battle of Torah study. In this light, the new elements chosen by God are the fresh, profound insights generated by the sages, and the battle at the gates is the intense intellectual debate taking place within the study halls. Through their dedication to learning, which served as an impenetrable spiritual shield, the Israelites were able to defeat the forces of evil and win the war without ever needing physical weapons [צוארי שלל, אלשיך, אהבת יהונתן].