Adam Clarke on Exodus 15:4

Pharaoh's chariots - his host - his chosen captains - On such an expedition it is likely that the principal Egyptian nobility accompanied their king, and that the overthrow they met with here had reduced Egypt to the lowest extremity. Had the Israelites been intent on plunder, or had Moses been influenced by a spirit of ambition, how easily might both have gratified themselves, as, had they returned, they might have soon overrun and subjugated the whole land.