Adam Clarke on Exodus 14:3

They are entangled in the land - God himself brought them into straits from which no human power or art could extricate them. Consider their situation when once brought out of the open country, where alone they had room either to fight or fly. Now they had the Red Sea before them, Pharaoh and his host behind them, and on their right and left hand fortresses of the Egyptians to prevent their escape; nor had they one boat or transport prepared for their passage! If they be now saved, the arm of the Lord must be seen, and the vanity and nullity of the Egyptian idols be demonstrated. By bringing them into such a situation he took from them all hope of human help, and gave their adversaries every advantage against them, so that they themselves said, They are entangled in the land, the wilderness hath shut them in.