|In the American Revolution|
The 5th left Monkstown, Ireland on 7 May 1774, for Boston, Massachusetts Bay Colony. Their presence was necessary because of strong civil unrest in the area. Arriving in July, 1774 the 5th camped near the town. On 19 April 1775, the Light Infantry and Grenadier Companies participated in the march to Concord, and the resulting fighting at Lexington, Concord, and the march back to Boston. Casualties were five men killed, three officers and 15 men wounded, and one man captured. On 17 June 1775, after being under siege by American forces for two months, the regiment participated in the attack on the fortifications at Breed's Hill (the Battle of Bunker Hill).
After spending two months on board ship in Halifax, Nova Scotia, the 5th sailed to New York to participate in the effort to capture the city from the Americans. They took part in the Battle of Long Island and the Battle of White Plains, the capture of Fort Washington, New York, the capture of Fort Lee, New Jersey. They then spent the winter of 1776-1777 quartered near New York City and were involved in skirmishes with the American forces. They were then part of Howe's campaign to capture Philadelphia, being engaged in the Battle of Brandywine Creek, where they broke the Continental Army's center at Chadds Ford, capturing 5 cannon. On the retreat through New Jersey, on 28 June 1778, the regiment was involved in the fighting at Monmouth Court House. While in New York, the 5th participated in several raids and skirmishes, including a raid on Little Egg Harbor, New Jersey.
They then embarked from New York on 3 November 1778, for the French West Indies, landing on 13 December 1778, on the island of Saint Lucia. The 5th was engaged with a small force of French and captured a four-cannon battery. On 18 December 1778, a force of 9,000 French troops landed on St. Lucia. The small British force of 1,400 men occupied a hill located on the neck of a peninsula. The French were fairly raw soldiers trained to fight in the classic European style of linear battles. The French advanced on the British force several times. The British, veterans of colonial fighting, inflicted a stinging defeat on the French. The French lost 400 killed and 1100 wounded to the British losses of 10 killed and 130 wounded, which included two officers from the 5th Foot.
After two years in the West Indies, the 5th Foot was sent to Ireland in December 1780. They were still in Ireland when hostilities between Great Britain, France, Spain, the Netherlands, and the former Colonies officially ended in 1783.
On 1 August 1782, all those regiments of the line that did not have a special title were given a county designation. The primary purpose was to improve recruiting, but no links were actually formed with the counties after which the regiments were named. The 5th became the "5th (Northumberland) Regiment of Foot": the county being chosen as a compliment to the colonel, Hugh Percy, 1st Duke of Northumberland.
In the peninsula war the regiment embarked for Portugal in July 1808 for service in the Peninsula War. The regiment fought in the Battle of Roliça and the Battle of Vimeiro in August 1808, the Battle of Corunna in January 1809 and the Battle of Bussaco in September 1810. It earned the nicknames the "Old and Bold", "The Fighting Fifth" and also "Lord Wellington's Bodyguard". It formed part of a small force which beat off an overwhelming body of the enemy at El Boden in 1811, a performance which Wellington notified to the Army as a memorable example of what can be done by steadiness, discipline, and confidence. The regiment was in the 3rd Division, 2nd Brigade under command of Major General Charles Colville, consisting of the 1st/5th Regiment of Foot, 2nd/83rd Regiment of Foot, 2nd/87th Regiment of Foot and the 94th Regiment of Foot.
The regiment went on to fight at the Siege of Ciudad Rodrigo in January 1812, the Battle of Badajoz in April 1812 and the Battle of Salamanca in July 1812 as well as the Battle of Vitoria in June 1813. It then pursued the French Army into France and saw action at the Battle of Nivelle in November 1813, the Battle of Orthez in February 1814 and the Battle of Toulouse in April 1814.
On 4 May 1836, the 5th became a fusilier regiment and was redesignated as the 5th (Northumberland Fusiliers) Regiment of Foot:
The King has been pleased to command, that the 5th, or Northumberland, Regiment of Foot shall in future be equipped as a Fusilier Regiment, and be styled the 5th Regiment of Foot, or Northumberland Fusiliers.