But a number of circumstances undermined him. The narrow camp, too much crowded with cottages, tents, huts and market booths, became confused even while there were no hostilities. Insects kept the troops restive. The supply of water, brought in barrels from the Río del Plan, was insufficient,[23.13] and many drank the crude sap of the maguey, which made them ill. A sort of cholera set in, and exposure produced lung troubles. Far worse, however, were the moral distempers. Some of the troops had turned their backs to the Americans at Palo Alto, the Resaca, Monterey and Buena Vista, while others had recently, to their utter amazement, seen heroic Vera Cruz and mighty Ulúa, the pride of Mexico, haul down their flags; and men of both classes represented the enemy as invincible. Every deserter was ordered shot, and this interference with a popular diversion gave offence.[23.14] Looking at the shaggy hills and ravines on his left, Santa Anna declared that a rabbit could not get through there. Perhaps not, thought many a soldier, but the Americans are not rabbits. About seven hundred yards in front of El Telégrafo stood a similar though somewhat lower hill called La Atalaya, which commanded a wide expanse of the rough country, and the engineers felt it should be fortified and strongly held; but the President would merely station twenty-five men there. Robles himself believed that Scott could turn the main position, and wanted fortifications erected at the extreme left; but Santa Anna would listen to no advice, and his cocksureness itself excited alarm. In private, officers talked of a disaster, and even Canalizo foreboded it. The tinder of a panic was ready.[23.14] [TWIGGS'S ADVANCE] Meanwhile Twiggs with two field batteries,[23.15] six 24-pounders, two 8-inch howitzers, four 10-inch mortars, and a squadron of dragoons--in all some 2600 men--set out in the footsteps of Cortez.[23.16] Most fortunately the troops had a stock of enthusiasm, for the beginning of the march was terrible. After going three miles along the beach they struck off at a right angle for six or eight on a deep, sandy road, sometimes three or four feet below the level of the ground, with a blazing sun overhead, not a breath of moving air, and Twiggs's horse for a pace-maker. Many threw away everything detachable, and the greater part of the division--at least four fifths, it was said--fell by the way. Some died, and many others did not rejoin the command for days. Unbroken mules and drivers ignorant of their business added to the difficulties. The meagre facilities for transportation did not permit even officers to have tents, and some of the scanty supplies were lost through the breaking down of wagons.[23.19]