Scott L. Mingus, Sr., award-winning Civil War author and lecturer, will speak on “The Louisiana Tigers in the Gettysburg Campaign.” The Tigers were one of the Army of Northern Virginia’s best-known (and most controversial) brigades. They played a critical role throughout the Gettysburg Campaign. Their storming and seizure of a vital fort in Winchester’s defenses caused the Union to abandon the town, opening the way north for Lee’s forces. Occupying York, Pennsylvania for two days, they were perhaps the single most-feared unit discussed in the Northern press. Scott will recount their history and exploits as well as their ill-fated attack on Cemetery Hill and their retreat from Gettysburg. Free. 319 Letcher Ave., Lexington.