There was no longer any question as to the expediency of evacuating the capital. The only doubt was as to the time of doing so, and the route. The Spanish commander called a council of officers to deliberate on these matters. It was his purpose to retreat on Tlascala, and in that capital to decide, according to circumstances, on his future operations. After some discussion, they agreed on the causeway of Tlacopan as the avenue by which to leave the city. It would, indeed, take them back by a circuitous route, considerably longer than either of those by which they had approached the capital. But, for that reason, it would be less likely to be guarded, as least suspected; and the causeway itself, being shorter than either of the other entrances, would sooner place the army in comparative security on the main land. There was some difference of opinion in respect to the hour of departure. The daytime, it was argued by some, would be preferable, since it would enable them to see the nature and extent of their danger and to provide against it. Darkness would be much more likely to embarrass their own movements than those of the enemy, who were familiar with the ground. A thousand impediments would occur in the night, which might prevent their acting in concert, or obeying, or even ascertaining, the orders of the commander. But, on the other hand, it was urged that the night presented many obvious advantages in dealing with a foe who rarely carried hostilities beyond the day. The late active operations of the Spaniards had thrown the Mexicans off their guard, and it was improbable they would anticipate so speedy a departure of their enemies. With celerity and caution they might succeed, therefore, in making their escape from the town, possibly over the causeway, before their retreat should be discovered; and, could they once get beyond that pass of peril, they felt little apprehension for the rest. These views were fortified, it is said, by the counsels of a soldier named Botello, who professed the mysterious science of judicial astrology. He had gained credit with the army by some predictions which had been verified by the events; those lucky hits which make chance pass for calculation with the credulous multitude.[164] This man recommended to his countrymen by all means to evacuate the place in the night, as the hour most propitious to them, although he should perish in it. The event proved the astrologer better acquainted with his own horoscope than with that of others.[165]