I came across this sentence:
He enforced the maintaining of all bona-fide transactions in clergy property, but advocated the revision of such contracts as might be proved fraudulent, and urged a concordat proposing that the state provide for the support of the clergy.
Maximilian in Mexico - Woman's Reminiscences of the French Intervention 1862-1867 Sara Yorke Stevenson
Why would the author use maintaining instead of maintenance? I couldn't find maintaining as a noun anywhere on the net and I am pretty sure she is using it as a noun which again it seems is not one of the meanings of the wor maintaining.
Is this an old fashion word?