He came languidly, placing himself in a good situation to see all the details.

This amused him sometimes a little, and made him endure the siege with patience; but it did not prevent his getting very tired, or from talking at every moment of returning to Paris--so that if the messengers and the spies had failed, his Eminence, notwithstanding all his inventiveness, would have found himself much embarrassed.
Nevertheless, time passed on, and the Rochellais did not surrender.

The last spy that was taken was the bearer of a letter.

This letter told Buckingham that the city was at an extremity; but instead of adding, "If your succor does not arrive within fifteen days, we will surrender," it added, quite simply, "If your succor comes not within fifteen days, we shall all be dead with hunger when it comes." The Rochellais, then, had no hope but in Buckingham.

Buckingham was their Messiah.