 On 31 August 1919, he became liaison officer in England for the Department of Repatriation.On 11 November 1919, McGlinn was attached to AIF Headquarters as president of the courts-martial which tried Father O'Donnell, the Australian Catholic Chaplain.On 14 October 1919, O'Donnell was arrested in Ireland for traitorous and disloyal statements concerning British policy in Ireland, allegedly uttered at the International Hotel, Killarney.