To be a little more exact, Cathal Brugha was the minister for defence during the revolution. Collins was head of intelligence. There duties overlapped at times and that caused great tension between the two. They also had different views of how the war should be fought. Brugha wanting pitched battles and Collins wanting gueriila warfare. The song refers to Brugha's cunduct during the 1916 rising which was by anybodies account valorous.
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