"
General Longstreet, to explain his delay, besides the above reasons scrapes together a number of others,-- such as the presence of some Federal scouts and pickets west of the Emmitsburg road, the movement of Sickles's rear-guard along that road, the presence of one of General Lee's engineers (who had been sent to give information, not to command his corps). No time need be wasted on these. The fact is that General Longstreet, though knowing fully the condition of things on the night of the 1st, knowing that Lee had decided to attack that part of the Federal army in his front, knowing that every hour strengthened Meade and diminished the chances of Confederate success, and knowing that his corps was to open the battle and deliver the main assault, consumed the time from daylight to nearly 4 P. M., on July 2d, in moving his troops about four miles, over no serious obstacle, and in getting them into battle. Meantime on the Federal side Hancock's corps, which had camped three miles from Gettysburg, reached the field by 6 or 7 A. M.; Siekles's two brigades that had been left at Emmitsburg came up by9 A. M.; the rear of the Fifth Corps by midday, and the Sixth Corps, after a march of thirty-two miles in thirty hours, by 2 P.M. Had Longstreet attacked not later than 9 or 10 A. M., as Lee certainly expected, Sickles's and Hancock's corps would have been defeated before part of the Fifth and the Sixth corps arrived. Little Round Top (which, as it was, the Fifth Corps barely managed to seize in time) would have fallen into Confederate possession; and even if nothing more had been done this would have given the field to the Confederates, since the Federal line all the way to Cemetery Hill was untenable with Round Top in hostile hands.
Fifth. That Longstreet's attack when made was poorly seconded by the other corps may be true, and thus another chance of winning a complete victory on July 2d was lost, but this does not change the fact that the first and great opportunity of that day for the Confederates was lost by Longstreet's delay.
Sixth. Victory on the third day was for the Confederates a far more difficult problem than on the second, but .it was still within their reach. But one need not be surprised at the failure of Pickett's attack after reading of the hesitation, the want of confidence and hearty cooperation, with which General Longstreet directed it. Lee never intended that Pickett, Pettigrew, and Trimble should fight unsupported by the remainder of the army. He expected "that with proper concert of action . . we should ultimately succeed." (Lee's report.) Longstreet was directed to use his whole corps, and when he felt embarrassed by the Federal forces on or near the Round Tops he was given a division and a half from A. P. Hill's corps, with power to call for more. General Long says: "The original intention of General Lee was that Pickett's attack should be supported by the divisions of McLaws and Hood, and General Longstreet was so ordered." (" Memoirs of Lee," p. 294. See also statements of Colonels Venable and Taylor, "Four Years with General Lee," p. 108.) Lee's efforts for a concerted attack were ineffectual. Pickett was overwhelmed not by troops in front but by those on his flanks, especially by those on his right flank, where Wilcox was sent forward too late to be of use, and where he was too weak to have effected much at best. Yet Longstreet did not use any part of Hood's and McLaws's divisions to support Pickett, or to make a diversion in his favor, or to occupy the troops on his flank which finally defeated him. These divisions were practically idle, except that one of Hood's brigades was occupied in driving off the Federal cavalry which made a dash on that flank. Longstreet, in a word, sent forward one-third of his corps to the attack, but the remainder of his troops did not cooperate. And yet he reproaches Lee for the result !
MCDONOGH, MD., February 16th, 1887."
http://ehistory.osu.edu/osu/books/battles/vol3/pageview.cfm?page=356
I have no disrespect for those who are Longstreet's fans. He was my favorite to until I started reading about him from different authors then and now which projected a different Longstreet. Even though this author was termed in the "gang of Lost Cause", there are references along with his take on what happened. Some respect is deserved by those "Lost Causers" that seem to have the same basic thoughts should be taken seriousely and do a study for confomation if one would be that interested.