Question

What incident prompted the old man to give an account of the Battle of Blenheim

Answer 1

When the children asked about the skull

Answer 2

The incident prompted the old man was the skull of the soldier. The old man who has found the objects while plowing the field told the children that it is a skull of a soldier who martyred in the battle of the Blenheim. Children asked the cause of the battle of Blenheim. An old man named Kaspar does know that hundreds of soldiers died in it, not only the soldier but also children and town people.