Question: Free Derry Corner memorialized which five-year protest? 

Context articles: Free Derry Corner
Dirty protest
1981 Irish hunger strike
Free Derry
Blanket protest
Springtown Camp
Museum of Free Derry
Johnnie White
Derry Citizens' Defence Association
Bogside

Free Derry Corner is a historical landmark in the Bogside neighbourhood of Derry, Northern Ireland, which lies in the intersection of the Lecky Road, Rossville Street and Fahan Street.
 A free-standing gable wall commemorates Free Derry, a self-declared autonomous nationalist area of Derry that existed between 1969 and 1972.
 On the corner is a memorial to the 1981 hunger strikers and several murals.
 There is also a memorial to those who died engaging in paramilitary activity as part of the Provisional IRA's Derry brigade.
The dirty protest (also called the no wash protest) was part of a five-year protest during the Troubles by Provisional Irish Republican Army (IRA) and Irish National Liberation Army (INLA) prisoners held in the Maze Prison (also known as "Long Kesh") and a protest at Armagh Women's Prison in Northern Ireland.
The 1981 Irish hunger strike was the culmination of a five-year protest during The Troubles by Irish republican prisoners in Northern Ireland.
 The protest began as the blanket protest in 1976, when the British government withdrew Special Category Status for convicted paramilitary prisoners.
 In 1978, after a number of attacks on prisoners leaving their cells to "slop out", the dispute escalated into the dirty protest, where prisoners refused to leave their cells to wash and covered the walls of their cells with excrement.
 In 1980, seven prisoners participated in the first hunger strike, which ended after 53 days.
Free Derry () was a self-declared autonomous nationalist area of Derry, Northern Ireland, that existed between 1969 and 1972.
 Its name was taken from a sign painted on a gable wall in the Bogside in January 1969 which read, "You are now entering Free Derry".
 The area, which included the Bogside and Creggan neighbourhoods, was secured by community activists for the first time on 5 January 1969 following an incursion into the Bogside by members of the Royal Ulster Constabulary (RUC).
 Residents built barricades and carried clubs and similar arms to prevent the RUC from entering.
 After six days the residents took down the barricades and RUC patrols resumed, but tensions remained high over the following months.
The blanket protest was part of a five-year protest during the Troubles by Provisional Irish Republican Army (IRA) and Irish National Liberation Army (INLA) prisoners held in the Maze prison (also known as "Long Kesh") in Northern Ireland.
 The republican prisoners' status as political prisoners, known as Special Category Status, had begun to be phased out in 1976.
 Among other things, this meant that they would now be required to wear prison uniforms like ordinary convicts.
 The prisoners refused to accept that they had been administratively designated as ordinary criminals, and refused to wear the prison uniform.
Springtown Camp was a United States military camp near Derry, in Northern Ireland, in use during World War II.
 It was sited outside the western part of the city, off the Buncrana Road in an area now covered by an industrial estate.
 After United States Navy had evacuated the camp at the end of the war, local people living in over-crowded terraced homes, sometimes three families living in one small house, broke into the camp and "squatted" in to the huts in August 1946.
 The huts although without running water, electricity or any means of heating, they still provided the families with space, which was lacking in their previous homes.
 After a public outcry the Londonderry Corporation who were unionist/Protestant in the majority and who only obtained power by vote gerrymandering, granted "temporary" rentals to the new occupants and charged rent.
 This agreement was supposed to last 6 months after which the families were to be housed in proper house in Derry City.
 But this never happened due to discrimination, as the residents of Springtown Camp were over 90% catholic/nationalist.
The quality of the accommodation was poor, however, and over time, children grew up, married and were obliged to live with parents, resulting in over-crowding.
 The conditions, in the tin huts deteriorated due to lack of repairs and became very unsafe, led to a sustained campaign for rehousing.
 The Corporation resisted this campaign for years but after a "silent" protest march by the residents from the camp to Derry's Guildhall was televised and beamed in to many homes throughout Ireland, pressure was mounting on the Londonderry Corporation to act.They again refused to re house the people of the camp, fearing the movement of so many catholic/nationalist to different areas of Derry could jeopardise their grip on power.
 However the residents protest gained so much support the Londonderry Corporation was forced to move on the rehousing of the people.
 Eventually all the residents were rehoused when on the 11th October 1967 the two last families were finally housed to make way for the Springtown Industrial estate.
 Springtown Camp which was to provide temperory housing for the people for a maximum of six months...was in existence for period of over twenty one years...
The Museum of Free Derry is a museum located in Derry, Northern Ireland that focuses on the 1960s civil rights era known as The Troubles and the Free Derry Irish nationalist movement in the early 1970s.
 Located in the Bogside district, the museum's exhibits include photographs, posters, film footage, letters and personal artifacts.
John (Johnnie) White (died 2007) was a high-ranking staff officer of the Official Irish Republican Army (Official IRA) in Derry, Northern Ireland and later Adjutant General of the Irish National Liberation Army (INLA).
 He was a key figure in Derry in the early years of the Troubles, and played a prominent role in the events surrounding the creation and defence of Free Derry.
The Derry Citizens' Defense Association (DCDA) was an organisation set up in Derry in July 1969 in response to a threat to nationalist residents from the Royal Ulster Constabulary (RUC) and civilian unionists, in connection with the annual parade of the Apprentice Boys of Derry on 12 August.
 This followed clashes with the RUC in January and April 1969, which resulted in widespread violence.
 The DCDA played a prominent role in co-ordinating the area's residents in the Battle of the Bogside, and was the effective government of the self-declared Free Derry from August to October 1969.
 Its leaders included Seán Keenan, Paddy Doherty and Johnnie White.
 Keenan and White were well-known republicans.
The Bogside is a neighbourhood outside the city walls of Derry, County Londonderry, Northern Ireland.
 The large gable-wall murals by the Bogside Artists, Free Derry Corner and the Gasyard Féile (an annual music and arts festival held in a former gasyard) are popular tourist attractions.
 The Bogside is a majority Catholic/Irish republican area, and shares a border with the Protestant/Ulster loyalist enclave of the Fountain.