The corps was transported to Ireland, fighting against the Jacobites, participating in the battles of the Boyne and Aughrim, as well as the sieges of Limerick, Cork, Kinsale, Athlone, and Galway.

[1] Thwarted again by the intervention of Imperial, Brandenburg, Saxon, Dutch, and English diplomats, backed up by threats of war from Sweden and Lüneburg, the Danish were forced to yet again return the disputed lands through the Treaty of Altona in 1689.

The troops would be subordinated to the English general-in-chief; the Danish lieutenant-general and major-generals forming part of his council of war.

[7] In accordance with the treaty, a Danish Auxiliary Corps of 996 horse and 6,109 foot, under the command of Ferdinand Willem, Duke of Württemberg-Neuenstadt, was sent abroad in 1689.

A fleet of 80 ships escorted by six man-of-war set sail in November in order to cross the North Sea.

Schoutbynacht Christopher Ernst von Støcken[8] managed to gather 60 of them and take refuge in the German Bight.

In December, they were ordered to proceed to Chester, but the corps could not leave York unless the officers and soldiers were paid so they could pay their debts.

Afraid of being outflanked, King James sent a large force from the main army upstream to strengthen his left wing.

This left only an inadequate Jacobite force facing the main Williamite army, which crossed the river at Oldbridge under heavy fire.

[14] Although the Williamite army failed to take the city, the Danish corps played a leading role during the Siege of Limerick.

On August 7, 100 Danish horse from Sehested's Regiment led the advance on the city together with 50 dragoons, followed by a brigade of fusiliers under Sir Henry Belayse.

On 16 August, the Irish made a sortie against the camp of the left wing of the Williamite army, but they were easily beaten back by the pickets of the Danish Guards.

[16] On 27 August, the Williamite siege artillery had made a serious breach in the walls of the "Irish town" section of the city.

[17] After the aborted siege of Limerick, King William left Ireland in September, leaving the Williamite army under command of the Dutch Count of Solms, who placed it in winter quarters.

Major-General Tettau was ordered to search the town, but finding it not worthwhile to occupy decided to remove its defences.

The Duke of Würtemberg marched to Cork with 340 horse, 50 dragoons, and 2,900 foot, of which 1,600 belonged to the Danish corps, and took up a position on the northern side, immediately outside the city walls.

Under the command of Major-general von Tettau, the troops forced its way into the burning northern liberties, driving the Jacobite defenders away from their outworks and back into the city.

The attack on the city began September 27, when a force of 100 grenadiers and 400 foot, of which 300 Danish, under Lieutenant-colonel Munchgaard, in the afternoon crossed the River Lee and continued until they were stopped by a moat in front of the walls.

Tettau and his men attacked again, and when an accidental explosion in the gunpowder magazine killed a large number of the defenders, the commandant surrendered.

Würtemberg's wing joined the main army under Dutch General Godert de Ginkel at Ballymore, and the campaign began on 6 June, when the town was taken.

The Williamite artillery bombarded the Irish Town, and soon damaged the castle and made a large breach in the wall at the western bridgehead.

The next day, an assault column of 600 grenadiers, under Tettau and Mackay, supported by six battalions crossed the river upstream, took the western ramparts, and held them until the main Williamite force came up.

When relief forces were beaten back, the town surrendered and the main Williamite army began its march toward Limerick.

A large force under the Duke of Würtemberg therefore crossed the Shannon on pontoons on 22 September, drove away the Jacobite cavalry outside the city and advanced towards it from the west.

The garrison of a fort on the west side of the river were driven towards the Thomond Bridge, but the defenders closed the gate and let the fleeing troops perish under the walls.