portion of the Union Army under Maj. Gen. Nathaniel P. Banks. On March 23, Jackson's cavalry commander, Col. Turner Ashby, brought faulty intelligence that the retreating Union division of Brig. Gen. James Shields had four regiments in the rear outside Winchester, Virginia. Since that force was of comparable size to Jackson's, he ordered Garnett and the Stonewall Brigade to attack. Unfortunately, Shields had a full infantry division on hand, almost 9,000 men, twice the size of Jackson's force. The attack went badly and Garnett, finding his brigade low on ammunition and surrounded by forces attacking from three sides, ordered a retreat. Jackson was infuriated and accused Garnett of disobeying orders, since he did not have Jackson's permission to retreat. Jackson, well known as a strict disciplinarian, arrested Garnett for "neglect of duty" on April 1 and relieved him of command. Garnett's court-martial started in August 1862, with only Jackson and his aide giving testimony. However the trial was suspended due to the start of Gen. Robert E. Lee's Northern Virginia Campaign and the Second Battle of Bull Run that August. Lee ordered Jackson to release Garnett from arrest and he was assigned to command the injured George Pickett's brigade in Lt. Gen. James Longstreet's First Corps in the Army of Northern Virginia. Garnett commanded the brigade credibly at the Battle of Antietam in September, after which he assumed permanent command of the brigade on November 26 when Pickett was promoted to divisional command, and at the Battle of Fredericksburg that December. He did not participate in the Battle of Chancellorsville in May 1863 because Longstreet's Corps was assigned duties in Suffolk, Virginia. Stonewall Jackson was gravely wounded at Chancellorsville and died soon after from pneumonia. Upon Jackson's death, Garnett returned to Richmond where the general's body lay in state. Despite his professional disagreement with Jackson, Garnett set aside any ill will against him and served as a pall bearer along with Longstreet, Richard S. Ewell, and others at his funeral. Gettysburg and death During the Gettysburg Campaign, Garnett's brigade continued in the division of George Pickett and, due to the order of march, did not reach the battlefield from Chambersburg, Pennsylvania, until late on the afternoon of July 2, 1863, missing the first two days of the Battle of Gettysburg. Pickett's division was assigned by Gen. Lee to lead a great assault on the Union's center on Cemetery Ridge on