Grant Cottage, Mt McGregor, NY
Grant's family was on the verge of impoverishment, and he knew that if he could finish his memoirs, he would save his family from bankruptcy. Dying of throat cancer, in great pain, he worked diligently to finish the book.... which he did, on July 20, 1863. He died three days later. The book was a huge international sensation, and is still a strong seller, and his family was financially secure.
So, Grant was not only a huge hero to the nation for his brilliance in defeating Lee's 'invincible' Army of Northern Virginia, ending the Civil War, and preserving the Union----- but he used that same dogged determination to finish his memoirs and save his family from poverty. Gotta love U.S. Grant!