Rashi on Exodus 14:2/רש"י על שמות י״ד:ב׳

1וישבו THAT THEY TURN backwards; all the third day they were moving nearer towards the Egyptians, in order to mislead Pharaoh, so that he should say: They have lost their way, as it is said, (v. 3) “so that Pharaoh will say of the children of Israel, [They are entangled in the land]”.

2ויחנו לפני פי החירת AND ENCAMP BEFORE PI-HAHIROTH — This is identical with Pithom (Mekhilta), but now it obtained the name of פי החירת, because there they became בני חורין free-men (חירת is explained as חרות freedom). This was two high, precipitous rocks and the valley between them was called פי הסלעים the mouth (opening) of the rocks.

3לפני בעל צפון BEFORE BAAL-ZEPHON — It (the idol of this name) alone had been left by God of all the gods of Egypt and, this, too, in order to mislead them — that they should say that their god was a difficult one to overcome. It was with reference to this that Job expressly said, (Job 12:23) “He causes the nations to err (מַשְׂגִיא, is taken in the sense of מַשְׁגִיא from root שגה to err) and then destroyeth them” (Mekhilta; cf. Rashi on this passage).