Closer to 15%; 257 out of 1924.
Out of the one hundred and 2 men in the Company that was directly surrounding him in the 32 survived. He was in the middle of the worst fighting and lost two horses in the same engagement.
So vicious was the charge he spearheaded that horses and riders were flung into the air from the impact of the collisions. He lost 219 in that charge 70 from the troops he was immediately leading.