With the extreme left flank of the union line exposed by Sickles' unauthorized advance, Union troops from the V Corps were rushed to defend the high ground there, known as Little Round Top, as the evening attack began. The brigade of Colonel Strong Vincent were the first to arrive and held the hill through the evening in desperate fighting. The 20th Maine, under Colonel Joshua Chamberlain and on the very end of the line, became famous that afternoon with a final desperate bayonet charge against Alabama infantry. (By John Osborne)