The Mekhilta offers a variant tradition that shifts the scene from the Red Sea to the Jordan River. When Israel crossed the Jordan into the Promised Land, all the kings of Canaan banded together to destroy them. The book of Joshua records this coalition in detail (Joshua 11:1-5): "And it was when Yavin king of Chatzor heard... and to the kings who were in the north... They went out with all their camps... All of these kings gathered together."
The language is overwhelming in its scope. Not some kings — all kings. Not some of their forces — all their camps. The entire military apparatus of Canaan converged on a single objective: the annihilation of the Israelite newcomers before they could establish a foothold in the land.
Joshua responded the same way Moses had responded at the Red Sea. He prayed. And exactly as before, the gathered armies were struck still as stone. The miracle repeated itself across the generations, proving that the divine protection extended beyond Moses personally to his successor and to the nation as a whole.
This variant tradition creates a deliberate parallel between the two crossings — the Red Sea and the Jordan — and the two prayer-warriors — Moses and Joshua. In both cases, the formula was identical: overwhelming military threat, a leader's prayer, and enemies turned to stone.