Mosby was not at Gettysburg. His book wasn't written and published until 1908; therefore, it cannot be considered a primary source of Stuart's actions during the battle. At best, it can only be considered as a secondary source, if that. A lot had been written about Stuart's actions between Gettysburg and 1908. With all due respect, Mosby's memoirs could only be reciting second hand information, which may or may have not been accurate...a problem all of us amateur hisorians have tp consider when we assess our sources.