The final defeat of the Egyptian army at the Red Sea was designed as a profound moral and spiritual lesson for the entire Egyptian empire. The primary approach among commentators is that this ultimate recognition of God was actually directed at the Egyptian citizens who remained at home and did not participate in the pursuit. Until this defining moment, only Pharaoh and his inner circle of ministers had truly experienced and understood the plagues, while the general public remained largely unaware of divine providence [העמק דבר]. Furthermore, after the Israelites initially departed, the Egyptians relapsed into denial, arguing that God was not the driving force behind the recent events [מלבי״ם].
The complete destruction of the concentrated Egyptian military forces at the sea was intended to elevate God's honor in the eyes of the survivors who would eventually hear the news [ביאור שטיינזלץ]. This event was not merely a show of power, but rather a direct call to repentance. God desired that the remaining Egyptians would finally recognize Him and change their ways, as He takes no pleasure in the death of the wicked [ספורנו]. On a broader scale, the downfall of such a massive force stands as a lasting warning for all future generations. It serves as a stark reminder to anyone who relies solely on military might and ignores morality, mistakenly believing that physical strength guarantees greatness and victory [רש״ר הירש].
God's honor would be unmistakably revealed when Pharaoh himself drowned alongside his entire army [אבן עזרא]. Interestingly, the exact moment the Egyptians fully recognized God's hand was not when the sea initially split, but rather when the waters crashed back down. Initially, the pursuing army mistakenly assumed the parting of the sea was a mere natural phenomenon. It was only when the waters suddenly reversed course, violently striking them from all sides while they were trapped in the seabed, that the reality of divine providence became undeniably clear to them [העמק דבר].