I found a tattered and well read copy of Michael Shaara’s The Killer Angels in a box of books. It won the Pulitzer Prize for Fiction in 1975. Here is a passage describing the Twentieth Maine’s famous charge down Little Round Top:

Chamberlain raised his saber, let loose the shout that was the greatest sound he could make, boiling the yell up from his chest: Fix bayonets! Charge! Fix bayonets! Charge! Fix bayonets! Charge! He leaped down from the boulder, still screaming, his voice beginning to crack and give, and all around him his men were roaring animal screams, and he saw the whole Regiment rising and pouring over the wall and beginning to bound down through the dark bushes, over the dead and dying and wounded. . . .