Excellent, Steve! Yes, the image depicts the mob attacking the warehouse in Alton, Illinois, where Elijah Lovejoy's printing press was stored. The event happened on November 7, 1837. Lovejoy was a minister and abolitionist newspaper editor, and he was shot and killed by a pro-slavery mob which attacked the warehouse and destroyed the printing press. Abraham Lincoln was critical of mob violence in his 1838 Lyceum Address.