Read the excerpt from Thoughts and Sentiments. I saw him take a gun, a piece of cloth, and some lead for me, and then he told me that he must now leave me there, and went off. This made me cry bitterly, but I was soon conducted to a prison, for three days, where I heard the groans and cries of many, and saw some of my fellow-captives. But when a vessel arrived to conduct us away to the ship, it was a most horrible scene; there was nothing to be heard but rattling of chains, smacking of whips, and the groans and cries of our fellow-men. What is Cugoano’s purpose in this excerpt?