Answer:
- It compares the intricacies of the battery to an art form.
Step-by-step explanation:
Metaphor is defined as the literary device when a comparison is established between two distinct objects in order to explain or clarify an idea by comparing the similarities or likelihood between them.
In 'An Episode of War,' the metaphor displaying the 'sound of the battery as the war-chorus' helps in comparing the side effects or intricacies of the battery to an art form which allows the readers to understand the idea more clearly and effectively.