The correct answer to this open question is the following.
I think Harriet Tubman's experience freeing enslaved people was so satisfactory to her and all the people that helped her in the Underground railroad.
She was a supporter of liberty and always wanted to help black slaves from the south to be free. That is why she escaped from slavery and later help many of them to get to the North before the beginning of the American Civil War.
I think her feelings might have been of liberation, a sense of purpose, and fulfilling a great accomplishment in life through helping a large number of people to be free.
The underground railroad was not an easy task, Quite the opposite. It had major risks in all senses.
The thing here is that she was already free, living in Pennsylvania when she decided to help her black "brothers and sisters." This action has inspired many people around the world in their fight for freedom, rights, and equality.
