How do you know who to believe when your friends, family or the news tell you different stories? Are they both telling the truth? What do you do to decide what to believe? Objective 1. To read and understand the main idea in a primary document. 2. To evaluate the value and effect of memory and bias on primary and secondary documents. 3. To analyze, compare and contrast a primary and secondary document. 4. To present their findings to the class and participate in a class discussion. Background Ulysses S. Grant woke up the morning of May 9, 1846, [morning after the Battle of Palo Alto] ready to Duration: 60 Minutes.