John "Jack" Brennan (Carrowkeel, Fuerty) 3rd Battalion South Roscommon, brother of Michael. He had originally been the Captain of Kilteevan Company. Jack was also on the first Sinn Fein County Council. On the 2nd of June 1916, he was sent to Wakefield Prison as an "honoured guest." Later he was transferred to Frongoch "The Irish University." In early 1917 he was present when Jim Quigley was sworn into the Volunteer movement. Brennan was appointed the first O/C of the South Roscommon Brigade. He later took the position of Vice O/C when Dan O'Rourke took overall command in late 1918. He took part in disarming two Lancers at Tarmon Cross in June 1920, the attack on Frenchpark Barracks 2 October 1920, and the Fourmilehouse Ambush. Ernie O'Malley stopped at Brennan's home, and received dressing for the wounds O'Malley had received in Ballymoe. Brennan's Volunteer activities aroused the suspicions of the local police and Black and Tans, who harassed his brother Jim by placing a hood over his head and threatening to shoot him. He was arrested during the Civil War on 18 August 1922, and sent to Athlone. Brennan served on the South Roscommon Brigade staff and was widely known and respected by the men. Long after the final salvo of the War, many who knew him regretted that Brennan had not been the permanent choice for Brigade Commander of South Roscommon. After the hostilities, he lived in Emlagh near Castleplunkett, and finally moved to Salthill, Galway. He died in 1973 and is buried in St. Coman's Cemetery in Roscommon town.