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We see Tuor climb out of the cleft with ease, when he recieves the warning against the coming flood. Thus it could be that once you had walked deep enough into the cleft the, even an army would be able to leave it. (Probably the north side was less step, but tuor could reach it, because he was from the start on south of the River.
Or I could imaging that Feanor and Fingolfin used the tunnel. But that the fortification with water covering the complete flour and the steps for easier travel were later build by Turgon.
Respectfuly
Findegil
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