Jamieson, Fausset and Brown on Exodus 14:10

10. when Pharaoh drew nigh, the children of Israel lifted up their eyes--The great consternation of the Israelites is somewhat astonishing, considering their vast superiority in numbers, but their deep dismay and absolute despair at the sight of this armed host receives a satisfactory explanation from the fact that the civilized state of Egyptian society required the absence of all arms, except when they were on service. If the Israelites were entirely unarmed at their departure, they could not think of making any resistance [Wilkinson and Hengstenberg].