The Fifth and Sixth were in the British force in Portugal under Sir Arthur Wellesley at the break-up of the French outposts at Rolica, and were joined by the Twentieth at Vimiera - a victory which resulted in the signing of the Convention of Cintra whereby the French agreed to evacuate Portugal. These three Regiments were also to fight alongside each other at the Battle of Corunna, where the French Marshal Soult, despite numerical superiority, was held off in a fighting withdrawal. After returning home, they all took part in the ill-fated Walcheren campaign.
The four Regiments all formed part of the British force in the Second Invasion of Spain in 1812. The Twentieth or 'Young Fusiliers', as it was nick named, was in the same division as the Seventh. The 1st and 2nd Battalions of the Seventh, and 1st Battalion of the Royal Welch Fusiliers, comprised the Fusilier Brigade under command of Sir William Myers at the Battle of Albuhera, 16 May 1811, where in a fierce counter-attack they routed a greatly superior force by storming the heights which had been captured by the French. This brigade was later to be commanded by Maj-Gen Ross, lately Colonel of the Twentieth. The fate of the French was sealed at Vittoria-a battle in which all four Regiments took part and which they carry as a battle honour to this day. The Regiments continued to fight alongside one another, each gaining the honours 'Pyrenees', 'Nivelle', 'Orthes', 'Toulouse' and 'Peninsula'.
In May 1836 the Fifth was made Fusiliers, having previously gained affiliation with Northumberland in 1784. The Sixth had previously become affiliated to Warwickshire in 1782 and become a Royal Regiment in 1832. The Twentieth, after nearly 100 years' connection with Lancashire, was renamed the Lancashire Fusiliers in 1881.
The Seventh and Twentieth served together in the Crimea but the next time all four Regiments served in the same theatre was in South Africa 1899-1902, although they did not all fight alongside each other in any particular battle of that campaign.
With 163 Battalions serving in the Great War it was always probable that the four Regiments would serve alongside each other again. The first of such battles was Le Cateau, followed by the Retreat from Mons, Marne 1914, Aisne 1914, 1918, Ypres 1914-15-17-18, Somme 1916, 1918, Arras, Passchendale, Cambrai 1917-18, and Gallipoli, to name a few. It was in the Gallipoli campaign that a Fusilier Brigade was in action again. 86 Brigade, comprising a battalion of the Seventh and of the Twentieth, achieved immortal glory at the landing on 25 April 1915. A Lancashire Fusilier Brigade subsequently joined them in the campaign, as did battalions of the Fifth and the Sixth.
The historic connections and affiliations between the four Regiments were continued in many theatres during the Second World War, notably in North West Europe, Tunisia, Italy and in Burma. These associations culminated in April 1958 when the Fifth, The Royal Northumberland Fusiliers, the Seventh, The Royal Fusiliers, and the Twentieth, The Lancashire Fusiliers, formed the Fusilier Brigade. They were joined on 1 May 1963 by the Sixth, The Royal Warwickshire Regiment, when that Regiment also became Fusiliers. The four Regiments worked very closely together, adopting the same uniform, badges and insignia.
After WWII the Royal Northumberland Fusiliers and Royal Fusiliers fought in Korea and all four regiments saw service in one of the many trouble spots around the world from Malaya to Kenya.
Since 1968 and the Regiments formation, Fusiliers have seen service across the world and found themselves at the sharp end in countries as diverse as Northern Ireland and Cyprus, More recently the Regiment served in the Balkans and took part in the first and second Gulf wars.
Today, Fusiliers both Regular and TA have served from Iraq to Afghanistan and are ready for deployment anytime, anywhere.