Which preposition to use with subserving

as Occurrences 1%

It would be even finer than it is, were not the Florentine pietra serena of the stonework so repellent in its ashen dulness, the plaster so white, and the false architectural system so painfully defrauded of the plastic forms for which it was intended to subserve as setting.

in Occurrences 1%

That the leaders of the Rebellion frankly admitted, that, excepting this one point of Constitutional grievance, the interests of the populations which they represented would be better subserved in the Union than out of it.

to Occurrences 1%

For, its magic properties depending wholly upon certain engraved characters, which I have gradually obliterated, it is at present unadapted to any other use than that of a wedding-ring, which it would subserve to admiration.

Which preposition to use with  subserving