Surely enough before long a hoarse, sullen roar arose, becoming louder and louder, till from the parapet surrounding the enclosure the great avenues that led to it could be seen dark with masses of warriors rolling on in a confused tide towards the fortress, while at the same time the flat roofs of the neighbouring houses were suddenly covered, as if by magic, with swarms of menacing figures, brandishing their weapons--a sight to appal the stoutest heart. FIGHTING IN MEXICO. When notice was given of the approach of the Aztecs, each man was soon at his post, and prepared to give them a warm reception. On they came, rushing forward in dense columns, each with its gay banner, and as they neared the enclosure they set up the hideous yell or shrill whistle used in fight, which rose high above the sound of their rude musical instruments. They followed this by a tempest of stones, darts, and arrows, which fell thick as rain on the besieged, and at the same time those upon the roofs also discharged a blinding volley. The Spaniards waited until the foremost column was within fire, and then, with a general discharge of artillery, swept the ranks of their assailants, mowing them down by hundreds. The Mexicans for a moment stood aghast, but soon rallying swept boldly forward over the prostrate bodies of their comrades: a second and third volley checked them and threw their ranks into disorder, but still they pressed on, letting off clouds of arrows, while those on the house-tops took deliberate aim at the soldiers in the courtyard. Soon some of the Aztecs succeeded in getting close enough to the wall to be sheltered by it from the fire of the Spaniards, and they made gallant efforts to scale the parapet, but only to be shot down, one after another, as soon as their heads appeared above the rampart. Defeated here, they tried to effect a breach by battering the wall with heavy pieces of timber, but it proved too strong for them, and then they shot burning arrows among the temporary buildings in the courtyard. Several of these took fire, and soon a fierce conflagration was raging, which was only to be checked by throwing down part of the wall itself, and thus laying open a formidable breach. This was protected by a battery of heavy guns, and a file of arquebusiers, who kept up an incessant volley through the opening. All day the fight raged with fury, and even when night came, and the Aztecs suspended operations according to their usual custom, the Spaniards found but little repose, being in hourly expectation of an assault. Early the next morning the combatants returned to the charge. Cortes did not yet realise the ferocity and determination of the Mexicans, and thought by a vigorous sortie he would reduce them to order, and, indeed, when the gates were thrown open, and he sallied out, followed by his cavalry, supported by a large body of infantry and Tlascalans, they were taken by surprise and retreated in some confusion behind a barricade