Which preposition to use with indefensible

on Occurrences 2%

Yet it was an evil indefensible on every ground that could possibly be alleged.

before Occurrences 1%

It was the opinion of Todleben himself, afterward expressed,which was that of Lord Raglan, and also of Sir Edmund Lyons, commanding the fleet,that the Star Fort which defended Sebastopol on the north, however strong, was indefensible before the forces that the allies could have brought to bear against it.

by Occurrences 1%

Paul's reasonings are those of a Gamaliel, and often are indefensible by our logical notions.

in Occurrences 1%

It is a law indefensible in principle and merely the accident of a radical government.

than Occurrences 1%

13.A late writer expresses his decision of the foregoing question thus: "Of all the different opinions on a grammatical subject, which have arisen in the literary world, there scarcely appears one more indefensible than that of supposing as follows to be an impersonal verb, and to be correctly used in such sentences as this.

Which preposition to use with  indefensible