Which preposition to use with centinels

over Occurrences 1%

They promised faithfully to bear their confinement with patience, and were very thankful that they had such good usage as to have provisions and light left them; for Friday gave them candles (such as we made ourselves) for their comfort; and they did not know but that he stood centinel over them at the entrance.

with Occurrences 1%

The magistrates allowed us a little guard during the night, and we employed a centinel with a kind of halbert for three pence a day.

from Occurrences 1%

I beg to day you'd lay that humour by, Till your Rencounter at the Nursery; Where they, like Centinels from duty free, May meet and wanton with the Enemy.

Which preposition to use with  centinels