The position of Cork was not a strong one, although, in the days before the use of artillery, it was considered well-nigh impregnable, being built upon the islands and marshes formed by the river Lea, and completely surrounded by two branches of the river. But upon three sides it was surrounded, at a short distance only, by high hills, which completely commanded it, and these hills were defended only by castles and forts of no great strength.
The garrison was but small, for the Irish were taken by surprise by the arrival of Marlborough's expedition, and had prepared only for a siege by Wirtemberg and his foreign division. They were therefore obliged to abandon Shandon Castle, and two adjoining forts, which defended the hills on the north of the city, and Wirtemberg's Danes at once took possession of these works, and, planting their guns there, opened fire on the northern quarter of the city.
Marlborough constructed his batteries at a monastery called the Red Abbey, on the south point of the river, where he was separated from the city only by the stream and narrow strip of marshy ground. These guns soon made a breach in the walls, and Marlborough prepared to storm the place, for, at low tide, it was possible to wade across the marsh and river.
The garrison, well aware that they could not long defend the place, now offered to capitulate on the same terms which William had granted to the garrisons of towns he had captured; namely, that they should be allowed to march out with the honours of war, with their arms and baggage, and to make their way unmolested to Limerick. The Prince of Wirtemberg was strongly in favour of these terms being granted, but Marlborough peremptorily refused. While a sharp dispute took place between the two officers, and before any conclusion could be arrived at, the tide rose, and the regiments drawn up ready to cross the river could no longer pass.
The firing then recommenced on both sides. Notwithstanding the efforts of the besieged to repair the injury to their wall, the breach daily increased in size. Wirtemberg moved his forces round from the north side, to take their share in the assault, and at low tide the English and Danes advanced against the breach. Under a heavy fire from the walls, they struggled through the marshes and entered the river, which, even at low tide, reached to their shoulders. Suffering heavily from the fire, they pushed forward until they nearly reached the breach. Here the Duke of Grafton, who commanded the British column, fell dead, with many officers and men; but the rest maintained their order, and were about to make a dash at the breach, when the governor, accompanied by Lord Tyrone, raised the white flag.
After a short parley, it was agreed that the garrison should become prisoners of war, but were to be protected in their persons and private property. The city was to be preserved from any injury, and the citizens and their property were to be respected.
Captain Davenant's troop had remained idle, during the siege, as there was no work for cavalry. They were quartered near an infantry regiment, which had been raised by MacFinn O'Driscol from among his own tenantry, and was commanded by him. O'Driscol was a relation of Mrs. Davenant, and the two commanders were often together. Both felt that the city must speedily fall, unless the Irish army moved down to its relief; but they agreed that, if it surrendered, they would make an effort to escape with their troops, for they had no faith in the observance of any terms of capitulation which might be made.
Accordingly, as soon as it was known that the governor had surrendered, and that the gates of the town were to be handed over to the British, O'Driscol and Captain Davenant formed up their commands, and, opening one of the gates, marched boldly out. The exact terms on which the garrison had surrendered were not known, and Marlborough and Wirtemberg were near the breach, arranging for the troops to take possession of the gates on that side. Consequently, the besieging forces opposite the gate from which the little column had marched out supposed that, in accordance with the arrangement, they were coming out to lay down their arms. They therefore stood aside as the column passed, being far more intent upon the plunder they expected to gather, in Cork, than on anything else. As, a few minutes later, the gates were opened and the troops poured into the city, no further thought was given to the little force which had marched out; and the five hundred infantry, and the troop of horse, were safe from pursuit before the news of the audacious ruse they had practised reached the ears of the generals.
Inside the town, the articles of the treaty were at once violated. The troops entered the town in crowds, and, incited, as in Dublin, by a mob calling themselves Protestants, they proceeded to plunder the houses and assault the Catholic inhabitants. The governor, M'Carty, was wounded. The Earls of Tyrone and Clancarty, with difficulty, made their escape from the mob. Many were killed, and a great destruction of property took place, before Marlborough and Wirtemberg entered the town and put a stop to the disorder, which inflicted great discredit upon them, as they had made no arrangements, whatever, to ensure the safety of the inhabitants, which they had solemnly guaranteed.
It was now October, and Marlborough at once set about the investment of Kinsale. On the very evening of the day he entered Cork, he sent off five hundred horse towards that town, and the next day marched thither himself at the head of his infantry. The works of Kinsale consisted of two forts, both of considerable strength, called the Old Fort and Charles's Fort. They were well supplied with stores and provisions for a siege. On the approach of the besiegers, the governor set fire to the town and retired to the forts, and, in answer to the summons to surrender, replied that "it would be time enough to talk about that a month hence."