Jim wrote:
The Peach Orchard was barely higher ground, only 20 ft higher (440 vs 464 per Warren map). Over the 1400 yds to Cemetery Ridge, this is trivial. The real error is the Sickles gave up a lot of open ground to his front. The distance from Cemetery Ridge just north of the George Weikert farm to Peach Orchard is about 1400 yards. In contrast the distance from the Peach Orchard to the nearest woods on Seminary Ridge is a bit under 600 yards. The additional 800 yards for the artillery to soften up the attacking CS infantry was no small factor as shown by the events of July 3rd. In addition, the 2nd Corps artillery to the north could also have made their contribution to Southern Discomfort.
-Jim
Pretty much this. The Confederates had very little ground to cover before hitting his lines, plus he had no flank support, plus he didn't have enough troops to hold his position.
But other than that, it wasn't a bad idea!
PS: Remember that Sickles didn't know exactly where the Confederates were; it was believed, they were to the north on Seminary Ridge and around the city. His skirmishers reported enemy activity, and
then he decided to advance. It seems to me that he should've advanced only if they didn't report any contact with the enemy, not if they did. I guess he was just convinced an attack was coming (which it was) and that the ground he was on was indefensible.
But his position did hold up the Confederate attack and make it waste momentum, time, and men, so maybe it benefited the Union in what basically became a defense-in-depth.