Sentence:  Many <WSD>bushwhackers</WSD> were young men born to families of southern heritage who were generally wealthier and more likely to own slaves than the typical Missouri farmer....His eldest daughter, Elisa, was an effective <WSD>bushwhacker</WSD> spy and informant. 
Meaning of the word marked with <WSD> tags:  A guerrilla (of either side) during the American Civil War.