Did Harriet Tubman kill slaves?

Didn't Harriet Tubman use to kill the slaves that wanted to go back to the south? Like if they were walking in the underground railroad and someone wanted to go back wouldn't she kill them, to protect everybody else. So no slaves would give up the others? When I was in 10th grade my teacher said she did, my... show more Didn't Harriet Tubman use to kill the slaves that wanted to go back to the south? Like if they were walking in the underground railroad and someone wanted to go back wouldn't she kill them, to protect everybody else. So no slaves would give up the others? When I was in 10th grade my teacher said she did, my husband is telling me now that's a lie.
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