Which preposition to use with duquesne

in Occurrences 2%

Even should we reach Fort Duquesne in safety, we will scarce be in condition to besiege it, unless the advance is conducted with rare skill and foresight.

against Occurrences 1%

Finally, on the twenty-ninth of June, the Half King, who had been our faithful friend throughout, brought us word that seven hundred French and three or four hundred Indians had marched from Fort Duquesne against us.

at Occurrences 1%

I would not give you to the Marquis Duquesne at Quebec, because then I might lose my pawn in the game, and, in any event, the Marquis Duquesne is retiring as Governor General of New France.

under Occurrences 1%

The small French corps, which sallied from Fort Duquesne under the orders of M. de Beaujeu, numbered only two hundred Canadians and six hundred Indians.

Which preposition to use with  duquesne