Shelby's Iron Brigade Brigade. The 3rd Brigade Combat Team, 1st Infantry Division was known as the Iron Brigade from its formation in 1917 through World War I, World War II and Vietnam, until some time in the early 2000s when, for reasons that are still unclear, the name was changed to Duke Brigade. The unit crest was an Iron Cross in a triangle, it appears that that was also changed. The 3rd Brigade of the 4th Infantry Division is also known as the Iron Brigade. Its unit crest is similar to the medals issued to veterans of the both Western and the Eastern
Battle of the Iron Triangle Infantry, 5th Division, had been selected to try to capture Base 82, having replaced its sister regiment, the 7th, in the Iron Triangle. Prior to an attack scheduled for 7 September, ARVN reconnaissance patrols had successfully reached the base's perimeter. The 8th Regiment formed a task force around its 1st and 2d Battalions, reinforced by the 5th Division Reconnaissance Company and a small armored troop with 3 M41 tanks, 3 M48 tanks, and 3 M113s. The 1st Battalion advanced south of Route 7, while the 2nd Battalion, with the reconnaissance company and the armored troops, advanced on an axis north