Irish regiments in service of Spain fight at the Battle of Saragossa, also known as the Battle of Zaragoza, on August 20, 1710, during the War of the Spanish Succession.

A Spanish Bourbon army loyal to Philip V of Spain and commanded by Alexandre Maître, Marquis de Bay, is defeated by a Grand Alliance force under Guido Starhemberg. Despite this victory, which allows Philip’s rival Archduke Charles to enter the Spanish capital of Madrid, the allies are unable to consolidate their gains. Forced to retreat, they suffer successive defeats at Brihuega in November and Villaviciosa in December, which effectively end their chances of installing Archduke Charles on the Spanish throne.

The 1710 Spanish campaign opens on May 15 when the Spanish Bourbon army commanded by Philip V in person and Francisco Castillo Fajardo, Marquis of Villadarias, advance on the town of Balaguer. Guido Starhemberg, commander of the Allied forces in Catalonia, halts this attempt by preventing the Spanish from fording the Segre River, a success in which the officers of the British contingent have a leading role.

Having received reinforcements, in June Philip makes another attempt upon Balaguer with 20,000 infantry and 6,000 cavalry but is defeated at Almenar on July 27. The allied troops take up a strong defensive position and repel the Spanish attacks until the British commander, James Stanhope, leading their vanguard, breaks the Spanish lines. Philip is forced to withdraw to Zaragoza, capital of Aragon, while Villadarias is replaced by the French general Alexandre Maître, Marquis de Bay.

On August 9, the Spanish army reaches Zaragoza and de Bay positions his troops with the river Ebro on his left and the Torrero heights to the right. On August 15, an Allied cavalry attack is repulsed, followed by five days of minor skirmishes before the Allies cross the Ebro in force on August 19 and are allowed to deploy during the night.

The two forces are roughly equal in strength, the allies having thirty-seven battalions of infantry and forty-three squadrons opposed to the Spanish-Bourbon army of thirty-eight battalions and fifty-four squadrons. The Allied left, composed of Catalonian and Dutch troops, is led by Pedro Manuel de Ataíde, 5th Count of Atalaia, the right by Stanhope, made up of British, Portuguese and Austrian cavalry, with Starhemberg in charge of the centre, mainly German, Austrian and Spanish infantry.

On August 20 at 8:00 a.m., an artillery-duel starts which lasts four hours before Stanhope charges the Bourbon-Spanish left. At first the Spanish and Walloon troops of the Bourbon army seem to gain the advantage, having defeated a body of eight Portuguese squadrons, which they chased from the field. This opens a gap in the Bourbon lines, which opens a gap for Stanhope who scatters the disorganized Spanish soldiers, while at the centre and the right their attacks are repulsed.

The battle follows the same pattern as at Almenar, with the allies repulsing fierce Bourbon cavalry charges before counter-attacked with their infantry and pushing the Spanish back. In less than three hours, the Allies army wins a comprehensive victory, capturing the Bourbon artillery along with 73 standards. Between 5,000 and 6,000 Spanish soldiers are killed or wounded, and another 7,000 captured, with Allied losses estimated as 1,500 men dead or wounded.

Archduke Charles enters Zaragoza the next day. The defeat of the army of Philip V of Spain is severe, the way to Madrid is open. Philip V abandons Madrid on September 9 and goes to Valladolid. Archduke Charles enters a very hostile and almost empty Madrid on September 28. Charles comments, “This city is a desert!” In the winter of 1710, Archduke Charles and the allied troops have to abandon Madrid, due to the great opposition of the people of Madrid and the dangerous strategic situation. After this, the British army suffers a defeat at the Battle of Brihuega, and the rest of the allied army is defeated at the Battle of Villaviciosa.