“Very well!”

“And in how many hours can you go from here to Vannes?”

“Oh! pardieu! in six hours. Three hours by sea to Sarzeau, three hours by road from Sarzeau to Vannes.”

“How convenient that is! Being so near to the bishopric; do you often go to Vannes?”

“Yes; once a week. But, stop till I get my plan.”

Porthos picked up his plan, folded it carefully, and engulfed it in his large pocket.

“Good!” said D’Artagnan aside; “I think I now know the real engineer who is fortifying Belle-Isle.”

Two hours after, at high tide, Porthos and D’Artagnan set out for Sarzeau.