 On May 27, 1863, Banks launched a poorly coordinated attack on the well-defended, well-fortified Confederate positions at Port Hudson.As part of the attack the first day, Cailloux was ordered to lead his company of 100 men in an almost suicidal assault against a high redoubt manned by two regiments of Confederate troops with heavy artillery support.Despite his company suffering heavy casualties, Cailloux, shouting encouragement to his men in French and English, led the charge of his entire regiment, a Minié ball tore through his arm, leaving it hanging useless at his side.