Irish Republic the Third Dáil, and all future institutions arising from it, as illegal. (See Second Dáil). The anti-Treaty side was then defeated in the Civil War. Most militant opposition to the Free State came to an end on 24 May 1923 when Frank Aiken, chief-of-staff of the IRA issued the order to "dump arms" and Éamon de Valera issued his address to the "Legion of the Rearguard". Éamon de Valera continued as president of the Sinn Féin political party. In March 1926, Éamon de Valera, along with most anti-Treaty politicians, founded a new party called 'Fianna Fáil' and ended their boycott
Éamon de Valera In April 1938, de Valera and British Prime Minister Neville Chamberlain signed the Anglo-Irish Trade Agreement, lifting all duties imposed during the previous five years and ending British use of the Treaty Ports it had retained in accordance with the Anglo-Irish Treaty. The return of the ports was of particular significance, since it ensured Irish neutrality during the coming Second World War. By September 1939, a general European war was imminent. On 2 September, de Valera advised Dáil Éireann that neutrality was the best policy for the country. This policy had overwhelming political and popular support, though some advocated Irish