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Once again due to the length involved Ill post this over several days

Battle of Gettysburg: Fighting at Little Round Top
The Battle of Gettysburg, and perhaps the fate of the Union, was decided in one hour of desperate fighting on the rocky ledges of Little Round Top.
By David F. Cross

In June 1863, Confederate military fortunes in the East were at their zenith. The Union Army of the Potomac had just been defeated at the Battle of Chancellorsville; flushed with victory, the Army of Northern Virginia began an invasion of the North. It seemed that one more decisive victory, this time on the soil of a Northern state, might crush the already sagging will of the North and force Abraham Lincoln's government to the bargaining table, where a negotiated peace could win the war for the Confederacy.

On July 1, in swift, dramatic consequence, General Robert E. Lee's army met the Army of the Potomac, commanded now by Maj. Gen. George Gordon Meade, at the Battle of Gettysburg. On the first day of the encounter, Lee's legions drove the Federal troops back through the town to a defensive position on Cemetery Ridge. Lee's army seemed invincible. At the end of the day, it looked like another great Confederate victory was in the making. More than just another battle might be won this time, however--possibly the entire war.

It did not turn out that way, of course. Better generalship by Meade, superior tactical decisions by his field officers and, most important, stubborn fighting by Federal troops, defeated the Confederates and drove them back to Virginia. With the retreating Rebel army, the specter of peace faded forever.

But it was close. Ever since, the "what ifs" of Gettysburg have haunted historians of the most momentous battle of the Civil War. One of the greatest imponderables surrounds the fateful struggle for Little Round Top. The Union defensive position on the second day of the battle resembled an inverted "J," extending from Culp's Hill on the north, around Cemetery Hill and irregularly south along Cemetery Ridge to Little Round Top. Geographically and strategically, the 650-foot-high Little Round Top anchored the left end of the Union Line. In Confederate hands, Lee's troops would have a springboard to attack the Union rear and force evacuation of Cemetery Ridge.

On the morning of July 2, the second day of the battle, Little Round Top was occupied by a division of the XII Corps commanded by Brig. Gen. John W. Geary. Meade ordered Geary's unit to rejoin the rest of the XII Corps at Culp's Hill and troops of Maj. Gen. Daniel E. Sickles' III Corps to take over Geary's position. But in the confusion, III Corps troops failed to arrive and Geary pulled his men out too soon, leaving Little Round Top undefended. Lee, with a sense for Federal weakness, chose to attack the southern end of the Union line. If the Confederate troops could crush this portion of the Union defenses and occupy Little Round Top, the whole Union line would become indefensible.

There were many crucial moments in the three-day battle at Gettysburg, but none more so than the defense of Little Round Top by the 20th Maine Regiment. Had the Maine Yankees been driven off Little Round Top, the Battle of Gettysburg might have had a different outcome. At least, Meade thought so, saying later, "But for the timely advance of the Fifth Corps and the prompt sending of a portion to Round Top, where they met the enemy almost on the crest and had a desperate fight to secure the position--I say but for these circumstances the enemy would have secured Round Top planted his artillery there, commanding the whole battlefield, and what the result would have been I leave to you to judge."

Fortunately for the Federal forces, it took Lee most of the day to assemble his troops and get them to the attack staging areas. His plan was to attack the Union left with 20,000 men while the rest of his army pressured the Union right. Major General John B. Hood's division, composed of Brig. Gen. E.M. Law's Alabama Brigade on the right and Brig. Gen. J.B. Robertson's Texas/Arkansas Brigade on the left, advanced first at about 4:30 p.m. They headed toward the southern end of the Union line defended by Maj. Gen. George Sykes' V Corps. As Law's brigade advanced, it wheeled obliquely to the left, hitting the western slope of Little Round Top and pouring into the gorge of Plum Run; it threatened to envelop the entire Union left flank. Lieutenant General James Longstreet later described this advance of Hood's division as the "best 3 hours of fighting ever done by any troops on any battlefield."

Meanwhile, Meade was feeding troops into his line as fast as they arrived on the battlefield. He was concerned about the Union left flank and sent his chief of engineers, Brig. Gen. Gouverneur K. Warren, to Little Round Top to assess the situation. Warren arrived at 3:30 p.m. and--to his utter surprise--found the hill undefended. Recognizing a disaster in the making, he frantically sent riders to Meade and Sickles commanding the adjacent III Corps, requesting immediate assistance. Sickles, whose troops were already hotly engaged, replied that he had none to spare. Fortuitously, Colonel Strong Vincent, who commanded the 3rd Brigade of the 1st Division, V Corps, intercepted one of the messages for help. He immediately recognized the strategic importance of the hill and led the 1,350 men of his brigade at the "double quick" to Little Round Top. Vincent positioned the four regiments of his brigade--the 20th Maine, 83rd Pennsylvania, 44th New York and 16th Michigan--along the southern and western slope facing the oncoming Rebels. His last words to the 389 men of the 20th Maine were: "This is the left end of the Union line. You understand? You are to hold this ground at all costs!"

Advancing against them were the 15th Alabama Regiment and seven companies of the 47th Alabama Regiment, under the command of Colonel William C. Oates. He had been ordered to "pass up between the Round Tops, find the Union left, turn it and capture Little Round [Top]." His men were drawn to their right by fire from a detachment of Major Homer R. Staughton's 2nd U.S. (Berdan's) Sharpshooters at the base of Round Top. Pushing them back, the Alabama regiments drove to the top of Round Top.

Pausing to rest, Oates aligned his men and sent them crashing down the northern slope of Round Top into the saddle between the hills. Suddenly, what he described as a "heavy force" of the enemy poured "a most destructive fire" into his troops from the slope of Little Round Top--it was Chamberlain's 20th Maine Regiment.

Oates had the advantage in numbers, 644 riflemen to 358 from Maine. He described the 15th Alabama as the "strongest and finest regiment in Hood's division." His men were battle hardened and supremely confident, boasting they'd "never been whipped." When they attacked, they struck hard, "with an impetuosity which betrayed the anticipation of an easy triumph." They must have been tired, however, having marched 28 miles in the previous 24 hours to get to the battlefield. Oates himself was not a professional soldier, having only become colonel of the 15th Alabama in May 1863, but he was known as a fearless and aggressive leader.

The men of the 20th Maine, in contrast to the Alabamians, were not veteran troops, having had little battlefield experience. These men were also tired; they had marched 107 miles in the past five days, including 26 miles the previous day, to get to the battlefield. Their colonel had been a professor of religion and romance languages at Bowdoin College. However, Joshua Lawrence Chamberlain sought to offset Oates'advantage with strength of position, better handling of his men, and iron determination. Chamberlain reported that every man who could carry a rifle, including "every pioneer and musician," was placed in the line. Two soldiers from the 2nd Maine Regiment being guarded by the 20th Maine Regiment while awaiting court-martial were also given rifles and willingly joined the battle line.