Answer:
The exact escape route of Harriet Tubman is unknown. As other slaves also used this escape route, Harriet Tubman did not name details until the end of her life. Nevertheless, many details have remained unknown. It is known that she used the Underground Railroad.
In the Preston area near the plantation of Dr. Ing. Anthony Thompson lived a very large Quaker community and it is likely that Harriet Tubman found shelter there. From there, she probably took an escape route, which was also used by many other slaves: In northeastern direction, this route led along the Choptank River, then through the state of Delaware to Pennsylvania. This escape route had a length of about 145 kilometers; on foot people needed between five days and three weeks. Harriet Tubman covered a large part of the route at night and used the Polarstern as a guide.