He tried to make us act plays and to enter into masquerades, in which the characters were drawn from the heroes of Roncesvalles, of the Round Table of King Arthur, and the chivalrous train who shed their blood to redeem the holy sepulchre from the hands of the infidels.
There are no more uses of "infidel" in the book.
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He described the Iraqi police as a tool in the hands of crusaders and infidels.
The infidel enemy has been badly wounded at the hands of your brothers and is close to its demise...