The Mekhilta teaches a principle of divine justice that echoes throughout the Hebrew Bible: the very thing a person boasts about becomes the instrument of their downfall. Sisra, the fearsome Canaanite general, is one of the most striking examples.
Sisra's great pride was his military hardware. He assembled a staggering force of nine hundred iron chariots — the ancient equivalent of an armored tank division — and rode against Israel with absolute confidence. In an age when most armies fought on foot, iron chariots represented the pinnacle of military technology. No infantry force could stand against them on open ground. Sisra believed his chariots made him invincible.
God had other plans. According to the Song of Deborah (Judges 5:20), "The stars fought from heaven. From their courses they fought against Sisra." The very heavens turned against the general who had placed all his trust in earthly weapons. The cosmic forces that Sisra never considered became the agents of his destruction.
The Mekhilta draws out the theological lesson: when a person elevates any created thing — whether military strength, physical beauty, or political power — to the level of ultimate trust, God demonstrates that no created thing can rival the Creator. Sisra's nine hundred iron chariots, which should have guaranteed victory, were rendered useless by rain, flooding, and the movement of the stars themselves. The punishment came not from some unrelated source, but from the precise domain in which Sisra had placed his arrogant confidence.