 From 1 April 1919 to 31 March 1920, Peter, once more serving under Sean T. Riordan, carried out all orders from his commanding officers as both a member of the Irish Volunteers and as a member of the I.R.B.He was connected with activities associated with the “Knocklong Train Raid”, and he carried despatches, trained in the use of arms, which he also collected, and spent time parading and drilling, among other activities during this period.1 April 1920 to 31 March 1921 was an extremely challenging time for Peter.