Which preposition to use with bombardings

of Occurrences 1%

To an unprejudiced sceptic, however, needle-guns, rifle-cannons, requisitions on the country, devastations of crops, bombarding of cities, and the rest of the accompaniments of his progress are, if possible, even worse in their effects upon the unhappy people subjected to his missionary efforts than the New England rum which accompanied the real missionaries in their descent upon the now depopulated islands of the Pacific.

Which preposition to use with  bombardings