Which preposition to use with crumblings

of Occurrences 21%

A year had made a great change in the castle, also, for, where were empty moats and the crumbling of neglect, all was now orderly and well kept.

before Occurrences 1%

Yet, caught in Paris at the outbreak of the war, my convictions underwent a rapid crumbling before the rising tide of French national feeling.

than Occurrences 1%

It was rather a crumbling than a fall.

Which preposition to use with  crumblings