Tyrconnell and James decided to bring Derry back under their control. On 2 or 3 April Major-General Jean Camus, Marquis de Pusignan, marched north with five regiments of foot. This brought the number of troops in the north to about 12000. James followed on 8 April, accompanied by d'Avaux and Melfort.
The passes On 13 April cavalry forming part of the Jacobite vanguard was reported approaching Derry. Lundy called a council of war that decided to defend a line along the
River Finn, SW of Derry, near
Strabane. Passes over the river at
Castlefin,
Clady, Long Causeway, and
Lifford were manned. On 15 April, this line was attacked by the cavalry vanguards of the two Jacobite armies, Hamilton's, which had come from Coleraine, and Rosen's, which had come from Dublin via
Charlemont. Hamilton's cavalry attacked on the Jacobites' left wing at Castlefinn and Clady. At Castlefinn they were repulsed by Colonel Skeffington's Regiment, commanded by
John Mitchelburne, but at Clady the cavalry under Richard Hamilton and
Berwick swam through the river and routed the defenders. This has been called the Battle of Cladyford. The Long Causeway was not attacked. Rosen's cavalry attacked on the right wing, at Lifford where Jacques de Fontanges, comte de Maumont crossed the river at the head of his cavalry and broke through the defences.
Lundy's blunder In the meantime, the English sent reinforcements to Derry. On the very day of the defeat at the Passes, on 15 April,
Colonel Cunningham and
Colonel Richards arrived on
Lough Foyle with the frigate , commanded by Captain
Wolfran Cornewall, and nine transport ships carrying two regiments, altogether about 1600 men. Cunningham, who was in charge, had been instructed to take his orders from Lundy, the governor. Lundy, disheartened by his defeat at the Passes, was convinced that the town was lost. On 16 April Lundy held a council of war with Cunningham and Richards from which he excluded most of the local commanders. He proposed the troops should not land and the town should be abandoned pretending that there were insufficient provisions to defend it. The proposal was accepted by all present. Lundy kept this resolution secret, but the people in town could see that many of the gentry and officers that had been present in the council prepared to leave and went down to the river to board the ships. Cunningham's fleet waited for Lundy still on 17 April but then left, apparently without him. The ships stopped over at
Greencastle on 18 April and sailed for England on 19 April. Finally, Lundy left the city disguised as an ordinary soldier and took a ship to Scotland.
Under the walls Having broken through the passes, Hamilton reached Derry on 18 April and summoned the city to surrender. The defenders asked for a delay of two days before a parley. They also insisted that the Jacobite army should halt at
St Johnston and not come nearer. However, when King James joined up with the army, Rosen suggested the King should appeal directly to his subjects in the town: they would surely submit to their King. The effect was the contrary. The men on the wall seeing him approach interpreted this act as a breach of their agreement with Hamilton and when James and his retinue rode up to within 300 yards of Bishops Gate and summoned the city, cannons were fired at them. According to a later account, he was rebuffed with shouts of "No surrender!" and one of the king's aides-de-camp was killed by a shot from the city's largest cannon, the "
Roaring Meg". James would ask thrice more, but was refused each time. That same day
Adam Murray reached the town. He and his cavalry unit had been part of the Protestant Army of the North and had fought at the passes. He came from Culmore along the river, broke through the still quite loose ring formed by the besiegers around the town, and reached Shipquay Gate, which Captain Morrison opened for him. On 19 April the town council appointed
Henry Baker governor of Derry. Baker put
George Walker in charge of the stores. On 20 April King James sent
Claud Hamilton, 4th Earl of Abercorn, with a last proposal to the walls. Murray talked with him and rejected it. James returned to Dublin with Rosen and left the forces before Derry under Maumont's command. However, Richard Hamilton also stayed and was of equal rank. Both had been promoted Lieutenant-General quite recently. Frictions sometimes arose between the Irish and the French officers about who was in command. On 21 April the besieged, led by Murray, sallied and killed Maumont. This has also been called the Battle of Pennyburn. Command devolved to Richard Hamilton. On 23 April Fort Culmore, which guarded the mouth of River Foyle, surrendered to the Jacobites. During another sally, on 25 April, the Duke of Berwick and
Bernard Desjean, Baron de Pointis, were wounded and Pusignan killed. On 6 May Brigadier-General
Ramsay attacked the Windmill Hill before the Bishops Gate and drove out the sentinels posted there by the besieged, but Baker knew the importance of this position and on the next day, the besieged sallied from the Ferryquay Gate and retook Windmill Hill. Ramsay was killed and other officers were taken prisoners. Among them were
William Talbot, a nephew of the viceroy,
Viscount Netterville and
Gerald FitzGerald, Knight of Glin. Baker built a line of earthworks from the river up to Windmill Hill and back through the Bog to the river downstream of the town. On 7 May Williamite England formally declared war on France. This officially sanctioned what was already happening around Derry since 18 April. Two French generals, Maumont and Pusignan, had already been killed in the siege. France never declared war on England as they saw James as the rightful king and the Williamites as mere rebels. On 11 May a French fleet landed more equipment and troops at Bantry Bay in southwestern Ireland and fought the
battle of Bantry Bay against an English fleet. The battle was inconclusive, but the French seemed to have had the advantage. On 30 May the besiegers received heavy guns and mortars. Before that date they only had field artillery.
Matthew Plunkett, 7th Baron Louth, and de Pointis were in charge of the mortars, which were placed on the right bank of the river where no sally could reach them. The mortars fired almost 600 explosive shells into the town. About this time disease and hunger took hold within the city. It became evident that the town needed to be relieved. William gave that task to Major-General
Percy Kirke, who decided to first explore the mouth of River Foyle to find out whether ships could get through to Derry. He sent the engineer
Jacob Richards, son of Solomon Richards, mentioned earlier, with the small (
sixth-rate) frigate HMS
Greyhound and two
ketches. They sailed from
Hoylake on 13 May and explored the mouth of River Foyle on 8 June. However,
Greyhound ran aground near Fort Culmore and was damaged by cannon shot before she got afloat, escaped and after some makeshift repairs limped back to
Greenock in Scotland to refit. Observations and information obtained from the inhabitants confirmed that the besiegers had placed a
boom across the river. Indeed, on 3 June, the besiegers, led by de Pointis, had placed a boom across the River Foyle about halfway between Derry and Culmore. On 17 May Major-General
Percy Kirke sailed from Liverpool with three men-of-war (HMS
Swallow, , and ) and 24 transport ships. The fleet carried four regiments (about 3000 men: Kirke's own,
Sir John Hanmer's, William Stewart's and
St George's). The last two were the regiments that should have landed with Cunningham. The convoy arrived in Lough Foyle early in June. The besieged saw it from the cathedral tower on the 13th. Kirke thought that he had too few troops to challenge the besiegers in battle and the incident with the
Greyhound seemed to show that it was too risky to approach the town by the river. On 4 June Richard Hamilton ordered to storm the town. The Jacobites attacked the line of earthworks and passed over them in some places but were finally beaten back. In order to accelerate the siege, James sent Rosen to Derry, who arrived on the scene at some time between 17 and 24 June. Rosen brought with him the regiment FitzGerald from
Trim. On 21 June Berwick was sent south with a detachment to keep the Enniskilleners away. Rosen intensified the bombardment and had a mine dug under a bastion. On 28 June
Clancarty came up from Munster to Derry with his regiment and led a daring night attack against the Butcher's Gate immediately on the evening of his arrival. The besieged were surprised and the attackers succeeded to come up against the gate and touch it but were eventually thrown back. At the beginning of June, Governor Baker fell ill and on 21 June a council was held to choose a successor. Baker was consulted and chose John Mitchelburne. On 30 June Baker died and Mitchelburne became governor of Derry. On 2 July Rosen herded Protestants from the surroundings to under the wall. The besieged responded by threatening to kill prisoners. Hamilton reported this event to James, who disagreed with Rosen's measure and called him a "barbarious Muscovite".
Relief Frederick de Schomberg, having been appointed commander-in-chief by William, ordered Kirke to attack the boom. Thereupon, on 28 July, Kirke sent four ships to the mouth of the River Foyle to try to bring food into Derry. These were HMS
Dartmouth and three merchant ships:
Mountjoy from Derry,
Phoenix from Coleraine, and
Jerusalem.
Dartmouth, under Captain
John Leake, engaged the shore batteries, while
Mountjoy, commanded by her Master Michael Browning, rammed and breached the boom, whereupon
Mountjoy and
Phoenix sailed up to Derry, unloading many tons of food. Seeing that he could no longer starve out Derry and not having enough troops to storm the town, Rosen decided to raise the siege. On 1 August the besieged discovered that the enemy was gone. On 3 August Kirke reported the raising of the siege to London. On 31 July another Jacobite army had been defeated at
Newtownbutler by the Enniskilleners. The city had endured 105 days of siege, from 18 April to 1 August. Some 4,000 of its garrison of 8,000 are said to have died during this siege. == Commemorations ==