The promise of Divine protection on the battlefield is deeply tied to absolute obedience to God's messenger. Success in the military campaigns of the Israelites depends not merely on physical strength, but on a complete alignment with the Divine will, which is transmitted through the angel guiding the nation. The primary approach among commentators is that the voice of this guiding angel is actually the word of God Himself, operating on the principle that the servant of the King is like the King [שד״ל, חזקוני, קאסוטו]. This absolute identity between the messenger and the Sender serves to calm the people, reassuring them not to fear being led by an angel. Recognizing that the angel's instructions are God's direct speech and fulfilling the King's will brings immense reward and a continuous, unlimited flow of miracles [מלבי״ם].
Fulfilling this Divine will goes beyond the simple practical observance of the Commandments. A unique approach suggests it requires a deep, thorough study of the Torah until the concepts are truly worthy of being considered the word of God [העמק דבר]. By the merit of this deep engagement with Torah and Commandments, God promises to uproot the forces of evil that seek to degrade those who study the Torah [אור החיים].
As a direct result of meeting these conditions of obedience and study, God guarantees that He Himself will fight the wars of the Israelites and become an active enemy to their foes [ביאור יש״ר, רלב״ג, שטיינזלץ]. In doing so, God will suspend His usual traits of goodness and mercy, showing absolutely no pity to those who stand against the Israelites [ספורנו]. This specific promise of bringing judgment applies broadly to the nations of the world, distinguishing them from the Canaanite nations, which were already marked for complete destruction [חזקוני].
The guarantee of protection is carefully divided into two distinct categories of threats, addressed measure for measure. The first group consists of enemies who harbor hatred toward the Israelites, whether openly or secretly in their hearts, but do not take action. The second group comprises active oppressors who cause actual harm, sometimes driven by personal gain rather than pure hatred. God promises to handle each threat accordingly. He will direct His hatred toward those who hate in their hearts, and He will actively return harm and distress to those who cause physical damage [מלבי״ם, העמק דבר]. Regarding this active punishment, the primary approach among commentators is that God will inflict intense pressure and deep distress upon these adversaries, perfectly mirroring the hardship they attempted to cause [רש״י, מזרחי, שפתי חכמים, ביאור יש״ר].