How did hannibal's men destroy the boulder a paragraph?

According to Livy they used boiling vinegar and fire to crack them, Polybius doesn't include that description, so there is some doubt as to whether this actually happened.Other methods, used at the time in quarries and engineering projects, might have involved using water poured into a crack, the water would expand on freezing; or wooden wedges jammed into a crack, which when soaked expand and cause the rock to break.