"So you are Herr Block, eh?" he demanded, eyeing Hal closely.
Hal bowed, but did not reply.
"As it chances," said the Dutch officer sternly, "I happen to be the brother of Herr Block, so I know you are not he. You are under arrest, sir."
"For what?" demanded Hal.
"For traveling under false passports, sir. You friends are under arrest also. You shall be sent to Amsterdam under guard. And you told me you were Dutch subjects!"
"No I didn't," said Hal. "I told you we carried Dutch passports, and so we do."
"It amounts to the same thing. It seems I have broken Dutch neutrality to help a batch of spies. You are all under arrest."
He summoned Captain Hodden to take charge of the four friends.
"You will be responsible for them," Colonel Block said.
The captain saluted and marched his prisoners away. They were put in a tent some distance away and a guard stationed over them. They were not searched.