[4] Keogh spent 10 months fighting against Mexican guerrillas on the Texan frontier in 1910, but was forced to retire from the army due to an abdominal gunshot wound.

Private Keogh was convicted of sedition in 1914, following an incident at the Curragh Camp involving British officers refusing to fight against Ulster Unionists, and served 28 days in the cells.

Due to his service during the retreat from Mons, he was awarded the 1914 Star, and following this he was captured and sent as a prisoner of war to Sennelager Camp, Westphalia.

"[3] Keogh contracted the Spanish Flu towards the end of the war, but recovered in time to join the right-wing militia group Freikorps which operated out of Munich.

During the battle, he operated a machine gun and was awarded the Siegfried Dagger of Honour, with a personal dedication from the deputy commanding officer Ernst Röhm.

News reached him that a riot had broken out in the barrack's gymnasium after an address from two local right-wing political agents.

Keogh recalled in his memoir recognising one of the attacked soldiers: "The fellow with the moustache gave his name promptly: Adolf Hitler.

He was involved in the smuggling of Mauser guns from Hamburg to Ireland, and met with Michael Collins, Arthur Griffith and Erskine Childers.

Once the Truce was signed ending the Irish Civil War, Keogh returned to Germany to bring his wife and children to Ireland, going on to serve as an engineer in the Free State army.

[4] During the Nazi Party's rise to power, Keogh increasingly feared that he could be targeted as he had known many of those killed during the Night of the Long Knives, and the family returned in Ireland.

The Director of the Bureau of Military History, prefaced Keogh's Witness Statement with: " his claims to importance, which he parades on every occasion, are regarded by those who have come into official contact with him as grossly exaggerated and completely unreliable.

Representing himself in the beginning to have been an NCO in the Brigade, his most recent letters to the press indicate that he now claims to have been a Captain and ADC to Roger Casement.