The Spaniards pushed on steadily, though the Mexicans, dashing their canoes against the sides of the causeway, clambered up and broke in upon their ranks. The soldiers, anxious only to make their escape, simply shook them off, or rode over them, or with their guns and swords drove them headlong down the sides of the dyke again. But the advance of such a body of men necessarily took time, and the leading files had already reached the second gap in the causeway before those in the rear had cleared the first. They were forced to halt, though severely harassed by the fire from the canoes, which clustered thickly round this opening, and many were the urgent messages which were sent to the rear, to hurry up the bridge. But when it was at length clear, and Magarino and his sturdy followers endeavoured to raise it, they found to their horror that the weight of the artillery and the horses passing over it had jammed it firmly into the sides of the dyke, and it was absolutely immovable. Not till many of his men were slain and all wounded did Magarino abandon the attempt, and then the dreadful tidings spread rapidly from man to man, and a cry of despair arose. All means of retreat were cut off; they were held as in a trap. Order and discipline were at an end, for no one could hope to escape except by his own desperate exertions. Those behind pressed forward, trampling the weak and wounded under foot, heeding not friend or foe. Those in front were forced over the edge of the gulf, across which some of the cavaliers succeeded in swimming their horses, but many failed, or rolled back into the lake in attempting to ascend the opposite bank. The infantry followed pell-mell, heaped one upon the other, frequently pierced by the Aztec arrows, or struck down by their clubs, and dragged into the canoes to be reserved for a more dreadful death. All along the causeway the battle raged fiercely. [Illustration]