23 And the Egyptians pursued, and went in after them to the midst of the sea, even all Pharaoh’s horses, his chariots, and his horsemen.

24 And it came to pass, that in the morning watch the Lord looked unto the host of the Egyptians through the pillar of fire and of the cloud, and troubled the host of the Egyptians,

25 And took off their chariot wheels, that they drave them heavily: so that the Egyptians said, Let us flee from the face of Israel; for the Lord fighteth for them against the Egyptians.

Eventually the Egyptians were able to get around the fiery, cloudy pillar and gave chase to the Israelites. Verse 24 makes it clear that the pillar did not vanish, but perhaps by the light of rising sun, during “the morning watch,” they were able to see well enough to navigate around it and follow their quarry into the sea.

Meanwhile, God watched all of the Egyptians’ doings from within the pillar. He watched as they stubbornly continued in their efforts to molest His people, and so He took away their chief advantage: their chariots. It says that He “took off their chariot wheels, that they drave them heavily.” This might mean that the wheels became sloughed down in the wet sand or mud that had been saturated by the Red Sea. No matter how hard they drove their horses, the dragging sludge was apparently too great, even to the point of breaking the wheels under the stress.

Now, at last, a panic fell upon the Egyptians. They were on foot, deprived of their speed, and caught between two great walls of water. Perhaps the Israelites had still been finishing their journey through the channel, and they had judged that they would be able to catch them before they were all out, thus God would not be able to close the channel without destroying His own people. But then, by getting partway through before losing their chariot wheels, they may have suddenly found themselves not able to reach one side or the other before the Israelites would fully vacate the chasm and God could close the channel with no friendly casualties.

They had stepped willfully into the trap, practically daring the Lord to destroy them, and finally they could see with their own eyes the manner of their destruction. They attempted to flee, acknowledging that God, Himself, was at war with them. It was, however, too late.