 The cavalrymen retreated and were withdrawn to barracks.On Mount Street, a group of Volunteer Training Corps men stumbled upon the rebel position and four were killed before they reached Beggars Bush Barracks.The only substantial combat of the first day of the Rising took place at the South Dublin Union where a piquet from the Royal Irish Regiment encountered an outpost of Éamonn Ceannt's force at the northwestern corner of the South Dublin Union.