His first efforts, directed against the gate on the north or north-east of the city, which led towards Mylasa, were interrupted by frequent sallies and discharges from the engines on the walls. After a few days thus spent without much avail, he passed with a large section of his army to the western side of the town, towards the outlying portion of the projecting tongue of land, on which Halikarnassus and Myndus (the latter farther westward) were situated. While making demonstrations on this side of Halikarnassus, he at the same time attempted a night-attack on Myndus, but was obliged to retire after some hours of fruitless effort. He then confined himself to the siege of Halikarnassus. His soldiers, protected from missiles by movable penthouses (called Tortoises), gradually filled up the wide and deep ditch round the town, so as to open a level road for his engines (rolling towers of wood) to come up close to the walls. The engines being brought up close, the work of demolition was successfully prosecuted; notwithstanding vigorous sallies from the garrison, repulsed; though not without loss and difficulty, by the Macedonians. Presently the shock of the battering-engines had overthrown two towers of the city-wall, together with two intermediate breadths of wall; and a third tower was beginning to totter. The besieged were employed in erecting an inner wall of brick to cover the open space, and a wooden tower of the great height of 150 feet for the purpose of casting projectiles.[221] It appears that Alexander waited for the full demolition of the third tower, before he thought the breach wide enough to be stormed; but an assault was prematurely brought on by two adventurous soldiers from the division of Perdikkas.[222] These men, elate with wine, rushed up single-handed to attack the Mylasean gate, and slew the foremost of the defenders who came out to oppose them, until at length, reinforcements arriving successively on both sides, a general combat took place at a short distance from the wall. In the end, the Macedonians were victorious, and drove the besieged back into the city. Such was the confusion, that the city might then have been assaulted and taken, had measures been prepared for it beforehand. The third tower was speedily overthrown; nevertheless, before this could be accomplished, the besieged had already completed their half-moon within, against which accordingly, on the next day, Alexander pushed forward his engines. In this advanced position, however, being as it were within the circle of the city-wall, the Macedonians were exposed to discharges not only from engines in their front, but also from the towers yet standing on each side of them. Moreover, at night, a fresh sally was made with so much impetuosity, that some of the covering wicker-work of the engines, and even the main wood-work of one of them, was burnt. It was not without difficulty that Philôtas and Hellanikus, the officers on guard,