The text from The Ferryman, page 59.
When the fighting started, Michael found himself with all the others holed up in the GPO with Patrick Pearce. On the Thursday, Michael and O'Rahilly led the charge out of the GPO, into the maw of English machine guns.
My questions are: Were they hiding? Not to be captured by the police? (OR were they hold by the police in the GPO?) And when they "led the charge", does it mean that they were taking the control out of the building - GPO? (OR did they decide to lead and clear the accounts with the English before they become the victims of the machine guns?)