First, Hancock did many things right, and historians have enumerated those facts. But Hancock did some things very wrong for a corps commander, though it was his first experience, beyond the division level.
Hancock lost half his ammunition wagons in the rear, when he moved his corps to Gettysburg.
Hancock ordered and used up all his division's long range artillery, before Pickett crossed towards Cemetery Ridge. Hancock's corps artillery, with complete view of the marching Confederate army, could only sit quietly until Pickett, Pettigrew and Trimble came into canister range.
I doubt there was an AoP artillery soldier on Cemetery Ridge that day, who didn't forget why Hancock's long range artillery was silent, as Pickett crossed towards the 2nd Corps lines.
Hancock lost half his ammunition wagons in the rear, when he moved his corps to Gettysburg.
Hancock ordered and used up all his division's long range artillery, before Pickett crossed towards Cemetery Ridge. Hancock's corps artillery, with complete view of the marching Confederate army, could only sit quietly until Pickett, Pettigrew and Trimble came into canister range.
I doubt there was an AoP artillery soldier on Cemetery Ridge that day, who didn't forget why Hancock's long range artillery was silent, as Pickett crossed towards the 2nd Corps lines.