Four lines of advance now offered themselves to Scott. By taking the cross-road to the right he could have skirted Lake Texcoco, passing the village of that name, and approached the north or the northwest quarter of Mexico. But the route would have been long, deficient in water and fuel, and circuitous; it was defended by Valencia with an ample supply of artillery; a movement in that direction would have made surprise or even sudden attack impossible for him; at a pass near Guadalupe Hidalgo stood fortifications; and a march round these would have involved another long circuit on exposed and unknown ground. This route, therefore, was not seriously considered. On the other hand, after the most thorough investigation, Scott had planned before leaving Puebla to take the cross-road to the left, march along the southern shores of Lakes Chalco and Xochimilco, and reach San Agustín, some ten miles to the south of Mexico; and it was for this reason that he placed Worth, who was to lead the movement while Twiggs was to menace Old Peñón, near Chalco.[25.17] On reaching the ground, however, unfavorable reports about this road were given by Mexican spies; and the General, partly for that reason and partly to mystify the enemy, reconnoitred the Peñón and also a fourth route, which led to the village of Mexicaltzingo, about five miles from the city. In regard to the Peñón his engineers--who pushed their investigations with the utmost intrepidity, studied every foot of the red ledges dripping with crimson gravel, and even penetrated behind the hill--decided that it could be carried, but only at a severe loss; while the evidence concerning the fourth possibility led to a substantially similar conclusion, supported by the additional objection, that apparently success would place the Americans on difficult and unknown ground. At about the same time Scott obtained further information regarding the Chalco route, which seemed to justify the opinion formed at Puebla. Consequently the orders to attack Mexicaltzingo--issued either because at the time Scott thought he should march that way or because he desired to mislead the cunning Mexican spies, who even gained the confidence of high American officers--were suddenly rescinded in the night of the fourteenth, and the next day, though Twiggs continued to threaten the Peñón until the morning of the sixteenth, all the rest of the army, headed by the cavalry and Worth's division, set out for San Agustín, distant from Chalco some twenty-five miles.[25.17]