John Calvin Commentary Exodus 15:4

"Pharaoh`s chariots and his host hath he cast into the sea; And his chosen captains are sunk in the Red Sea." — Exodus 15:4 (ASV)

Pharaoh’s chariots. Moses, in these words, only meant to assert that the drowning of Pharaoh was manifestly God’s work. Therefore, he now illustrates in more glowing terms the transaction which he had before simply narrated; as he also does when he compares the Egyptians to stones and lead, as if to say that they were hurled by God’s mighty hand into the deep, so that they had no power to swim out.

For this reason, he repeats the mention of God’s “right hand” twice, as if to say that such a miracle could not be ascribed either to fortune or to human efforts. We must note what he says soon after: that the Egyptians “rose up against” God because they had treated His people with injustice and cruelty. From this, we gather that God’s majesty is violated by the wicked whenever His Church—whose safety He has undertaken to preserve by His faithful patronage—is assailed by them.

The phrases You sent forth your wrath, and with the blast of your nostrils the waters were gathered together, are to be read in conjunction; for their meaning is that God, without any instrumentality, but by His simple volition, and in manifestation of His wrath, brought the enemy to destruction.