M. de Treville was not at his hotel. His company was on guard at the Louvre; he was at the Louvre with his company.
It was necessary to reach M. de Treville; it was important that he should be informed of what was passing. D'Artagnan resolved to try and enter the Louvre. His costume of Guardsman in the company of M. Dessessart ought to be his passport.
He therefore went down the Rue des Petits Augustins, and came up to the quay, in order to take the New Bridge. He had at first an idea of crossing by the ferry; but on gaining the riverside, he had mechanically put his hand into his pocket, and perceived that he had not wherewithal to pay his passage.