Which preposition to use with unfasten

from Occurrences 6%

The old dog was trying to follow me; but could come no further, owing to the rope, with which I had hauled him up, being still tied 'round his body, the other end not having been unfastened from the tree.

for Occurrences 2%

Alethea-Belle unfastened for the second time the lid of the basket; once more the flat head protruded, hissing.

after Occurrences 1%

Therefore, at last she was reluctantly compelled to quit her post of observation, and retrace her steps by the rough byroad to the house, entering by one of the windows of the morning-room, of which the burglar-alarm was broken, and which on many occasions she had unfastened after her nocturnal rambles with Stewart.

on Occurrences 1%

She rose to her feet, and going quickly to the chamber of the prince, entered therein without call or knock, for the door was unfastened on the latch.

Which preposition to use with  unfasten