Yes, the title is a misnomer. The question was originally asked by the Mechilta on the verse . And that question is as follows: ""And he took six hundred choice chariots" ( 14:7 ): Whence came the horses required for the chariots? If you would say, from Egypt, is it not written (Ibid. 9:6) "and all the cattle of Egypt died"? And if you would say, from Pharaoh, is it not written (Ibid. 3) "Behold, the hand of the Lord is in your cattle in the field, in the horses, etc."? And if you say, from Israel, is it not written (Ibid. 10:26) "And our cattle, too, will go with us; not a hoof will remain"? Whence, then, did they come?" Now, the Mechilta goes on to explain that the horses belonged to those Egyptians who feared Hashem and listened to Moshe's warnings during the plagues that killed the domesticated animals. But earlier this evening I thought of two other possibilities: 1. The midrash in Shemot Rabbah 10:2 says (loose translation): ...