In 1915, he moved to the Guaranty Trust Company of New York where he remained until his return to Ireland the following year. Michael Collins first became known during the Easter Rising in 1916. A skilled organiser of considerable intelligence, he was highly respected in the IRB, so much so that he was made financial advisor to Count Plunkett, father of one of the Rising's organisers, Joseph Mary Plunkett, whose aide-de-camp Collins later became. When the Rising itself took place on Easter Monday, 1916, he fought alongside Patrick Pearse and others in the General Post Office in Dublin.
Joseph Mary Plunkett
Collins