ten o'clock
The Confederates were massing their artillery on Seminary Ridge . The Union legions were burrowing and planting new batteries . Fifteen thousand helpless , wounded men lay on the field through the long hours of the night . At ten o'clock a wounded man began to sing one of the old hymns of Zion whose words had come down the ages wet with tears and winged with human hopes . In five minutes ten thousand voices , from blue and gray , had joined . Some of them quivered with agony . Some of them trembled with a dying breath .