With a cheer that sounded like a roar the troops hurried down the slope, and burst into the suburb. For some time the work was easy, for in fear of the Libertad guns all the western section had been evacuated; and raising a fierce cry that afterwards came to be known as the "rebel yell," which began with a growl and rose to a falsetto scream, the Americans dashed on at a run. Beyond the cemetery, however, Mexican troops opened fire, and until some of Duncan's and Mackall's guns came up, fought like demons. Barricaded streets and garrisoned roofs were next encountered, and again the Americans dived into the houses. Making a small hole in the wall that divided two dwellings they would drop through it a six-inch shell with a three-seconds fuse lighted, and throw themselves flat. Results followed promptly. The aperture was then enlarged; and crawling through, they repeated the operation, while the best marksmen fought from the roof.[12.10] Taylor's withdrawal from the city, however, supplied the Mexicans with reinforcements. The enemy fairly seemed to swarm, and their courage seemed to rise. "Cannons and small arms flashed, crashed and roared like one mighty storm of wind, rain, hail, thunder and lightning," wrote a soldier; while the thud of planks against heavy doors and the blows of pickaxes on walls of stone swelled the uproar. Once the advance was halted. But Colonel Hays, a shy man with a broad forehead, a Roman nose, brilliant, restless hazel eyes, and the courage of twenty lions packed in his delicate frame, had been a prisoner in the Monterey post-office once, and had sworn a great oath to sleep this night in the post-office or in hell, and nothing could stop him. By dark the Americans were only a square from the market-place, and the Colonel had the postal accommodations at his command.[12.10] Ampudia's case was by no means desperate even now. His losses had been small--twenty-nine officers and 338 men killed and wounded, according to his report. There were provisions, ammunition and artillery enough; the strong buildings round the plaza and market-place, defended with resolution by a large garrison, could not easily have been taken; and the division of the Americans into widely separated commands invited a sortie.[12.10]