Which preposition to use with unharnessed

by Occurrences 1%

The Boy seemed not to relinquish the hope of stirring the tired Colonel to enthusiasm. "Don't you like the way, after the worst sort of day, when you stop, he just drops down in the snow and rolls about a little to rest his muscles, and then lies there as patient as anything till you are ready to unharness him and feed him?" "and if you don't hurry up, he saves you the trouble of unharnessing by eating the traces and things.

from Occurrences 1%

Above a sea of threatening arms and brandished sticks and angry faces rose the figures of two German soldiers, with carbines slung across their backs, mounted on work-horses which they had evidently hastily unharnessed from a wagon.

in Occurrences 1%

When Mr. and Mrs. Waring were out, David took the horse to the barn and unharnessed in the dark.

Which preposition to use with  unharnessed