Republican Convention is held in Chicago, Illinois. William H. Seward, Salmon P. Chase and Abraham Lincoln of Illinois are the leading contenders from a field of 12 candidates. Lincoln wins on the third ballot. Hannibal Hamlin of Maine, an outspoken, long-time abolitionist is chosen for vice-president.
Pemberton agrees to attack the federal line with Johnston. The focal point of the attack, Champion Hill, will change hands three times, but the Confederate forces fail to meet. Pemberton withdraws to Vicksburg