Around Will 1921, he led an ambuscade in the Royal Irish Constabulary patrol in Tourmakeady, County Mayo, killing four. Maguire's flying column then made for the Partry Mountains. In the subsequent British army dragnet, his adjutant Michael O'Brien was killed. Maguire was maimed, however managed to escape.

In the 1921 elections to Dáil Éireann, Maguire was returned unopposed as Teachta Dála (TD) for Mayo as a Sinn Féin candidate. He opposed a Anglo-Irish Treaty, and apart from either saying "Níl" ("no" around English) when a vote was known as, did non participate in any real way in the Dáil accord debates. He was returned unopposed in the 1922 general election. In the 1923 general election, Maguire faced a contest & succeeded inside securing a 2nd of 5 seats in the Mayo South constituency, winning 5,712 votes (a part of Seventeen.82 percent).

Maguire remained the TD until 1927. He experienced at a start indicated the willingness to contest the June 1927 general election as a Sinn Féin candidate but withdrew when a Irish Republican Army threatened to court-martial any member under General Army Order 28, which forbade its members from substitute elections. (Despite this ban, IRA officers Seán O’Farrell (Leitrim-Sligo) and Dr John A. Madden (Mayo North) contested the election, the latter successfully).

Maguire later on drifted away from a IRA. Within 1932, a Mayo IRA officer reported that Maguire, currently firmly aligned by using Sinn Féin, refused to call on men to join a IRA once speaking at republican commemorations. After challenged on this, Maguire claimed that, when a IRA “were there are no hanker a equivalent when it wont to be�, he disagreed using a organisation.

Maguire and republican legitimitism
Inside December 1938, Maguire was one of the class action of vii humans, world health organization experienced been elected to the Second Dáil in 1920, who met sustaining a IRA Army Council under Seán Russell. At this meeting, a vii sign away what it believed were a "executive powers of Government of Dáil Éireann" to the Army Council to "hold in trust". Henceforward, a IRA Army Council percieved itself to exist as a legitimate government of the Irish Republic &, on this basis, the IRA and Sinn Féin justified their rejection of the states of the Republic of Ireland and Northern Ireland and political abstentionism from their parliamentary institutions. After a majority of IRA & Sinn Féin decided to abandon abstentionism in the 1969/70 split, Ruairí Ó Brádaigh and Dáithí Ó Conaill sought and secured Maguire's recogntion of the Provisional IRA as the legitimate successor to the 1938 Army Council. Also in the aftermath of the 1986 split in the Republican Movement (Ireland), Maguire once againside rowed into the argument, & in a statement check in 1986 but issued posthumously in 1994, he conferred this "legitmacy" on the Army Council of the Continuity IRA.

These are important to note that although a 1938 conferring has been crucial to the ideology of republican legitimitists, its validity is rejected per overwhelming majority of the Irish humans. A minuscule & unimportant Republican Sinn Féin, which has no public political representation, is a exclusively person within Ireland which continues to subscribe to the look at that the unelected seven-member Army Council of the Continuity IRA is the legitimate government of the Irish humans.

See Also
Second Dáil Republican Sinn Féin Continuity IRA