How did the 1938 defense agreement help Ireland remain neutral during World War II?

The 1938 defense agreement was instrumental in securing Ireland's neutrality during World War II because it facilitated the transfer of three naval bases from British control to the Irish state.1

Under the terms of the 1921 treaty, these ports had remained occupied by the British military. By negotiating their return with British Prime Minister Neville Chamberlain, Eamon de Valera effectively completed the process of establishing full Irish sovereignty. This removal of foreign military presence from Irish territory was a prerequisite for maintaining a neutral stance, as it allowed the government to assert control over its own defense policy.1

While de Valera pledged that Ireland would not serve as a base for attacks against Great Britain, the recovery of these ports ensured that the Irish state could maintain its independence, which de Valera viewed as the ultimate expression of the nation's sovereignty.1