What examples demonstrate Harriet tubman heroism

Going back to free 300 more slaves after she made it to the northern states.

She did what ever it took to take her passengers to safe land. Also, she would always head the same direction, but used different paths. Therefore, if some slave when back and told the others which path she took, they would not find her because the routs she'd take weren't the same. She was the conductor, and they were the passengers.