"Not a cloud in the sky," he remarked, "and yet that noise is growing louder."
It was, indeed, as they all could hear.
"It's guns, that's what it is," declared Bert "It sounds like Fourth of July."
"That's what it does," agreed his cousin Harry. "It's back of those hills. I'm going to see what it is."
"So am I!" cried Bert. The boys had finished their dinners, and now started off on a run in the direction of the booming sounds.
"Come along," said Uncle Daniel to Mr. Bobbsey. "We may as well go also."
"I want to come!" cried Freddie.
"Not now," said his mother. "Wait until papa comes back."
Mr. Bobbsey, with his brother and the two boys, soon reached the top of the hill. All the while the sound like thunder was growing louder. Then puffs of smoke could be seen rising in the air.
"What can it be?" asked Bert.