Royal Marine Light Infantry

Royal Marine Light Infantry
Unit name	Royal Marine Light Infantry
Dates	1855–1923
Country	United Kingdom
Branch	Royal Navy
Type	Infantry
Role	Naval infantry, amphibious warfare
Size	Battalion, Brigade
Garrison	Portsmouth, Plymouth, Chatham
Motto	"Per Mare, Per Terram"
Notable commanders	Edward Owen, John Fullerton, Horatio Nelson, Arthur Wilson, 1st Baron Wilson

Royal Marine Light Infantry is a former branch of the British Royal Marines formed in the mid-19th century to provide a light, mobile naval infantry force for Royal Navy operations, colonial expeditions, and amphibious assaults. It existed alongside the Royal Marine Artillery as the two principal corps of the Corps of Royal Marines until their amalgamation in 1923, serving in conflicts from the Crimean War through World War I. The unit's organization, training, equipment and traditions reflected evolving doctrines in amphibious warfare, imperial policing, and combined operations with the Royal Navy and British Army.

History

The Royal Marine Light Infantry was created in 1855 amid reforms after the Crimean War, reorganizing earlier units such as the Chatham Division and Plymouth Division and inheriting precedents from the Royal Marine Artillery and the historical Corps of Colonial Marines. Its officers and ranks included figures who later served in campaigns like the Second Opium War, the Indian Rebellion of 1857, and the Anglo-Zulu War, interacting with formations such as the East India Company forces and the British Expeditionary Force. During the late 19th century the RMLI participated in the Mahdist War, the Second Boer War, and numerous small-scale interventions in West Africa, the Far East, and the Mediterranean Sea. In World War I elements of the RMLI served in combined operations at the Gallipoli Campaign, the Battle of the Somme, and in the Western Front trench warfare context, cooperating with units from the Royal Naval Division and infantry brigades of the British Army. Post-war reductions and interwar reorganization culminated in the 1923 unification with the Royal Marine Artillery to form a single Corps of Royal Marines, a process influenced by reviews by the Committee of Imperial Defence and the Secretary of State for War.

Organisation and Structure

The RMLI's structure combined shipboard detachments, shore battalions, and divisional garrisons at depots such as Portsmouth, Plymouth, and Chatham. Its hierarchy mirrored service patterns seen in the Royal Navy and the British Army, with company, battalion and brigade formations commanded by officers commissioned from institutions like the Royal Naval College, Greenwich and promoted through staff colleges including the Staff College, Camberley. The corps maintained specialist branches—signals, machine-gun detachments, and light infantry skirmishers—that liaised with units such as the Royal Engineers, the Royal Artillery, and naval brigades aboard HMS President and other vessels. Administrative changes in the late 19th and early 20th centuries were driven by legislation debated in Westminster and by service directives from the Admiralty.

Recruitment, Training and Uniform

Recruitment drew volunteers and later conscripts from ports and industrial towns including Portsmouth, Plymouth, Liverpool, Glasgow, and Bristol, with selection emphasizing seamanship, marksmanship and physical fitness; recruits often transferred from or to units like the Royal Navy Reserve and the Territorial Force. Training establishments included depots at Deal, Kent and exercise camps used alongside army ranges at Aldershot and Shoeburyness, incorporating drills from the Infantry Training Centre curriculum and marksmanship instruction influenced by the Small Arms School Corps. Uniforms combined naval and army elements: dark blue tunics, forage caps and later peaked caps, with distinctions such as light infantry badges, shoulder titles and buttons similar to those of the Royal Marines Artillery before amalgamation. Medals and decorations awarded to RMLI personnel included the Victoria Cross, the Distinguished Service Order, and campaign medals issued by the War Office and the Admiralty.

Operational Deployments and Campaigns

RMLI units embarked aboard HMS Excellent, HMS Terrible, HMS Indomitable and other capital ships for amphibious landings, coastal raids and garrison duties. They fought in major expeditions such as the Barracks of the Baltic Campaign during the Crimean War and were prominent in colonial operations like the Bombardment of Alexandria (1882), the Pekin Expedition of 1860, and punitive actions during the Mahdist Uprising. During the Second Boer War detachments performed convoy escort, siege operations and blockhouse garrisoning alongside the Coldstream Guards and Royal Fusiliers. In World War I the RMLI formed specialized units for landing operations in the Gallipoli Campaign, served in the Dardanelles, and provided companies to the Royal Naval Division at engagements including the Battle of Jutland in naval contexts and trench actions along the Ypres Salient.

Equipment and Weaponry

Early RMLI armament included smoothbore muskets and cutlasses used aboard frigate and ship of the line detachments, evolving to the Enfield Rifle series, the Lee-Enfield rifle and the Vickers machine gun by the early 20th century. Sidearms included the Webley Revolver and boarding axes for shipboard actions; support weapons comprised the Stokes mortar and trench mortars used in World War I operations. Coastal and landing craft used by the RMLI included launches, cutters and early motorised assault boats developed in conjunction with Admiralty workshops and trials at naval bases like Portsmouth Dockyard.

Traditions, Insignia and Culture

The RMLI preserved naval traditions such as mess customs, marching music drawn from the Royal Marines Band Service, and mottos like "Per Mare, Per Terram" shared across marine formations. Insignia included light infantry badges, gorget patches, collar dogs and shoulder titles reflecting links to the Royal Navy and to historic units like the Royal Marine Artillery and the pre-1855 marine companies. Regimental culture emphasized seamanship, marksmanship and adaptability, with ceremonial duties performed at locations including Buckingham Palace and naval ceremonies in Spithead reviews, and with veterans' associations maintaining ties through organizations such as the Royal Naval Association and the Imperial War Graves Commission.

Amalgamation and Legacy

The 1923 amalgamation with the Royal Marine Artillery to form a single Corps of Royal Marines followed recommendations from post-war defence reviews, affecting deployment doctrine for amphibious warfare that later influenced World War II planners at Combined Operations Headquarters and figures like Louis Mountbatten, 1st Earl Mountbatten of Burma. The RMLI legacy endures in modern marine doctrine, preserved collections at the Royal Marines Museum, uniforms and colours displayed at the National Maritime Museum and in regimental histories written by authors such as Arthur Johnson and chronicled in archives at the National Archives (United Kingdom). Its contributions to amphibious tactics, small-boat operations and naval infantry traditions influenced successor formations across the Commonwealth and in allied services including the United States Marine Corps.

Category:Royal Marines Category:Military units and formations of the United Kingdom