The consensus seemed to be that if really large numbers of men were sent to storm the mountain, then enough might survive the rocks to take the citadel. This is essentially the basis of all military thinking.
It was possibly the most circumspect advance in the history of military maneuvers, right down at the bottom end of the scale that things like the Charge of the Light Brigade are at the top of.
It is a long-cherished tradition among a certain type of military thinker that huge casualties are the main thing. If they are on the other side then this is a valuable bonus.