The Irish War of Independence was a key point in Ireland's struggle to break from British rule. It was fought between 1919 and 1921. Here, we'll explore how it began, how it was fought, and its legacy.

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What Was the Irish War of Independence?

The Irish War of Independence was fought between 1919 and 1921. It was fought between Irish republican forces and the British authorities in Ireland. It started after the Declaration of Independence was issued by the First Dáil. It was slightly different from many other conventional wars you may have studied before, as it was mainly fought through ambushes, intelligence operations, and political confrontation.

The aftermath of a fire at the British Irish Steam Ship Co. 1921.
The aftermath of a fire at the British and Irish Steam Ship Co. Warehouse on Thursday, 5 May, 1921.
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What Was the Irish War of Independence?

The Irish War of Independence was a guerrilla conflict fought between 1919 and 1921 between Irish republican forces and British authorities in Ireland. Its goal was to end British rule and establish an independent Irish state following the Declaration of Independence in January 1919.

The conflict took place between January 1919 and July 1921, with negotiations continuing later that year.
Irish Republican Army units fought British police and military forces across the country.
The war played a decisive role in shaping modern Irish political history.

Why Irish Independence Became Inevitable

Irish nationalism had moved beyond limited self-government toward complete independence by the early 20th century. Political frustration, cultural revival, and repeated delays in Home Rule had made republican sentiment across Ireland stronger than it had been for decades even after the famine. In the lead-up to the First World War, it became clear to many Irish people that independence couldn't be achieved peacefully.

British rule was increasingly viewed as incompatible with Irish political aspirations.
Nationalist organisations expanded their influence and support before the war began.
Public confidence in peaceful reform declined sharply after repeated setbacks.

British Rule and Irish Nationalism

Britain used political control, land systems, and policing structures to enforce governance in Ireland. Nationalist movements had sought reform for years, but change was too slow and ineffective. This growing discontent sowed the seeds for stronger Irish revolutionary nationalism.

British administration was centred on Dublin Castle and closely tied to London.
Irish nationalist movements gained strength through political and cultural activism.
Opposition to British authority became increasingly organised and vocal.

The Easter Rising and the 1918 Election

The Easter Rising of 1916 was technically unsuccessful, but its success was seen in how it transformed Irish opinion. The execution of the leaders generated widespread sympathy and radicalised Irish politics. In the 1918 general election, Sinn Féin won and rejected participation in Westminster.

The Easter Rising became a powerful symbol of sacrifice and resistance.
British executions increased support for republican ideals.
Sinn Féin established the First Dáil instead of taking seats in London.

How the War of Independence Began in 1919

When the First Dáil met in Dublin and declared Ireland an independent republic, the War of Independence officially began. An ambush at Soloheadbeg in County Tipperary was the first armed action in the conflict. Both of these events could be considered the beginning of the war.

The Declaration of Independence was issued on 21 January 1919.
Republican leaders asserted the authority of an Irish government separate from Britain.
Armed resistance began almost immediately alongside political action.
The Irish War of Independence lasted
3

years.

The First Dáil and the Declaration of Independence

The First Dáil claimed to be the legitimate government of Ireland in one of the most important moments for Irish statehood. It rejected British rule in Ireland and aimed for recognition of the Irish Republic both at home and abroad. It was the political side of the armed campaign that followed and helped lend it legitimacy.

Elected Irish MPs formed Dáil Éireann in Dublin.
The Dáil adopted a democratic programme and a constitution.
Irish leaders sought international support for independence.

The Emergence of the Irish Republican Army

The Irish Republican Army was developed from the Irish Volunteers. It answered to the Dáil and operated independently of British control. With strong local support, it operated in secrecy to fight the War of Independence, using guerrilla tactics and ambushes.

IRA units were organised at the county and local levels.
Fighters were often drawn from the communities where they operated.
Military actions focused on weakening British authority rather than holding territory.
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How the War Was Fought Across Ireland

Rather than large-scale battles, the Irish War of Independence was one of guerrilla warfare. Republican forces avoided direct confrontation, using targeted attacks and ambushes on police patrols, intelligence agents, and infrastructure. There was fighting throughout Ireland, particularly in Dublin and Cork.

Ambushes were used to disrupt British policing and military operations.
Transport and communication networks were frequently sabotaged.
Violence and reprisals affected towns, cities, and rural areas alike.
Over
2,000

people were killed during the Irish War of Independence.

Guerrilla Warfare and Flying Columns

Flying columns were the IRA units that mainly operated in rural areas. Fighters could strike quickly and withdraw before British forces could respond. As a result, the British Army struggled to establish control.

Soldiers guarding tobacco,
Three huge casks of tobacco being guarded by soldiers.
Flying columns consisted of small, highly mobile groups.
Local knowledge of terrain played a crucial role in their effectiveness.
Guerrilla tactics limited the British forces' ability to retaliate directly.

Urban and Rural Conflict in Dublin and Cork

In Dublin, the conflict featured intelligence gathering and targeted killing. In Cork and rural areas, the aforementioned flying columns carried out attacks on police and military targets. These two areas in particular were key to the overall campaign.

Dublin saw intense intelligence and counter-intelligence operations.
Cork emerged as a major centre of armed resistance.
Civilian life was often disrupted by raids, curfews, and reprisals.

British Forces, Policing, and Reprisals

The British authorities had to rely on policing to suppress the republican campaign. Additional forces were deployed to support the Royal Irish Constabulary. The reprisals against civilians hardened public opinion and intensified resistance.

Policing was central to Britain’s strategy in Ireland.
Military support increasingly supplemented civilian law enforcement.
Reprisals caused widespread damage to homes and businesses.

The Royal Irish Constabulary

The Royal Irish Constabulary was the IRA's main target for many operations. Members faced frequent attacks. The weakening of the force means British authority declined in many areas.

RIC in Limerick.
RIC military and armoured car leaving Limerick on a scouting expedition.
Police barracks were attacked or abandoned across the country.
Morale within the RIC deteriorated during the conflict.
Intelligence gathering became increasingly difficult for British authorities.

The Black and Tans and the Auxiliaries

The Black and Tans and the Auxiliaries were recruited as reinforcements for the RIC. They were infamous for their violent actions against civilians. The result was an Irish population pushed even further away from supporting British rule.

Many recruits were former British soldiers.
Accusations of arson and indiscriminate violence were widespread.
British policy in Ireland faced growing international criticism.
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Who Were the Black and Tans?

The Black and Tans were British recruits, many of them former soldiers, brought in to reinforce the Royal Irish Constabulary during the conflict. Their reputation for reprisals, arson, and violence against civilians intensified public support for Irish independence.

Key Figures of the Irish War of Independence

The conflict was shaped by some key political and military figures. Certain famous Irish figures were closely associated with decision-making, negotiation, and public perception. However, it should be known that there were still disagreements on how independence would be achieved and what it would look like.

Michael Collins

Michael Collins
Role:
Director of Intelligence, Irish Republican Army
Summary:
Michael Collins played a central role in organising the IRA's intelligence network and guerrilla campaign. His leadership shaped how the war was fought, particularly in Dublin.

Michael Collins was responsible for the IRA's intelligence campaign. His role included coordinating operations in Dublin and across the country. He later led the Irish delegation during negotiations.

Éamon de Valera

Éamon de Valera
Role:
President of Dáil Éireann
Summary:
Éamon de Valera was the political leader of the Irish Republic during the War of Independence. He represented Ireland internationally and later opposed the Anglo-Irish Treaty.

Éamon de Valera was President of Dáil Éireann during the War of Independence. His focus during the War of Independence was on diplomacy and international recognition for the republic. He later proposed the Anglo-Irish Treaty.

Arthur Griffith

Arthur Griffith
Role:
Founder of Sinn Féin, Treaty Negotiator
Summary:
Arthur Griffith led the Irish delegation that negotiated the Anglo-Irish Treaty in London. His role was crucial in securing the end of the conflict, despite the controversy the Treaty caused.

Arthur Griffin founded Sinn Féin. He was head of the Irish delegation during the Treaty negotiations in London. His work helped bring the War of Independence to an end.

The Truce, the Treaty, and the Path to Civil War

With neither side able to secure a military victory, a truce was agreed. Negotiations featured several key sticking points. The truce ended the war, but it was only a temporary solution as Irish society remained divided on several key issues.

Both sides recognised the limits of continued fighting.
Negotiations replaced armed conflict after July 1921.
Disagreement over the settlement created lasting divisions.

In my opinion [the Treaty] gives us freedom, not the ultimate freedom that all nations desire and develop to, but the freedom to achieve it.

Michael Collins, Dáil Éireann debate, 19 December 1921
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What Did the Anglo-Irish Treaty Decide?

Signed in December 1921, the Anglo-Irish Treaty ended the War of Independence and created the Irish Free State as a self-governing dominion. However, it confirmed the partition of Ireland and divided Irish opinion, directly leading to the Civil War.

Irish Independence and the Legacy of the War

The War of Independence reshaped Ireland and laid the foundations of the Irish state. However, it also left several unresolved issues, and its legacy continues to influence Irish politics and debate over a century after it ended. However, all of that is too complex and nuanced to get into here.

The Irish Free State emerged from the conflict.
Political divisions created during the war persisted for decades.
The period remains central to Irish national memory.

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Joseph P

Joseph is a French and Spanish to English translator, copywriter, and all-round language enthusiast.