CHAPTER XLVI Few families in the north end of town slept that night for the news of the disaster to the Klan, and Rhett’s stratagem spread swiftly on silent feet as the shadowy form of India Wilkes slipped through back yards, whispered urgently through kitchen doors and slipped away into the windy darkness.
There are no more uses of "stratagem" in the book.
Show samples from other sources
And I think of rats again and how sometimes, to pass the interminable hours, Teacup and I would plot our campaign against the vermin, stratagems and tactics, waves of attack, each more ridiculous than the last, until she dissolved into hysterical laughter, and I gave her the same speech I gave Zombie on the firing range, the same lesson that now comes home to me, the fear that binds killer to prey and the bullet connecting both as if by a silver cord.
Rick Yancey -- The Infinite Sea
If more is said that Marie-Laure cannot overhear—if there is a pantomime going on between them, notes passed, stratagems agreed upon—she cannot say.