Great were the exertions now made, both by the besiegers and the besieged, to carry on the contest with the utmost vigor. Hamet went the rounds of the walls and towers, doubling the guards and putting everything in the best posture of defence. The garrison was divided into parties of a hundred, to each of which a captain was appointed.
Some were to patrol, others to sally forth and skirmish with the enemy, and others to hold themselves armed and in reserve. Six albatozas, or floating batteries, were manned and armed with pieces of artillery to attack the fleet.
On the other hand, the Castilian sovereigns kept open a communication by sea with various parts of Spain, from which they received provisions of all kinds; they ordered supplies of powder also from Valencia, Barcelona, Sicily, and Portugal. They made great preparations also for storming the city. Towers of wood were constructed to move on wheels, each capable of holding one hundred men; they were furnished with ladders to be thrown from their summits to the tops of the walls, and within those ladders others were encased, to be let down for the descent of the troops into the city. There were gallipagos, or tortoises, also being great wooden shields, covered with hides, to protect the assailants and those who undermined the walls.
Secret mines were commenced in various places: some were intended to reach to the foundations of the walls, which were to be propped up with wood, ready to be set on fire; others were to pass under the walls, and remain ready to be broken open so as to give entrance to the besiegers. At these mines the army worked day and night, and during these secret preparations the ordnance kept up a fire upon the city to divert the attention of the besieged.
In the mean time, Hamet displayed wonderful vigor and ingenuity in defending the city and in repairing or fortifying by deep ditches the breaches made by the enemy. He noted also every place where the camp might be assailed with advantage, and gave the besieging army no repose night or day. While his troops sallied on the land, his floating batteries attacked the besiegers on the sea, so that there was incessant skirmishing. The tents called the Queen's Hospital were crowded with wounded, and the whole army suffered from constant watchfulness and fatigue. To guard against the sudden assaults of the Moors, the trenches were deepened and palisadoes erected in front of the camp; and in that part facing Gibralfaro, where the rocky heights did not admit of such defences, a high rampart of earth was thrown up. The cavaliers Garcilasso de la Vega, Juan de Zuniga, and Diego de Atayde were appointed to go the rounds and keep vigilant watch that these fortifications were maintained in good order.
In a little while Hamet discovered the mines secretly commenced by the Christians: he immediately ordered counter-mines. The soldiers mutually worked until they met and fought hand to hand in these subterranean passages. The Christians were driven out of one of their mines; fire was set to the wooden framework and the mine destroyed. Encouraged by this success, the Moors attempted a general attack upon the camp, the mines, and the besieging fleet.
The battle lasted for six hours on land and water, above and below ground, on bulwark, and in trench and mine; the Moors displayed wonderful intrepidity, but were finally repulsed at all points, and obliged to retire into the city, where they were closely invested, without the means of receiving any assistance from abroad.