Read it through once

As the youth left the scene behind him, he heard the guns suddenly roar out. He imagined them shaking in black rage. They belched and howled like brass devils guarding a gate. The soft air was filled with the tremendous remonstrance. With it came the shattering peal of opposing infantry. Turning to look behind him, he could see sheets of orange light illumine the shadowy distance. There were subtle and sudden lightnings in the far air. At times he thought he could see heaving masses of men.