They gained entry to Mountjoy, but were discovered before they could free MacEoin and had to shoot their way out. They later abandoned the armoured car after removing the Hotchkiss machine guns and setting fire to what they could. Towards the end of the war, in May 1921, the two principal fighting units of the IRA's Dublin Brigade, the "Squad" and the "Active Service Unit" were amalgamated after losses suffered in the Burning of the Custom House.
The IRA gained entry to Mountjoy but was discovered before they could free MacEoin and had to fight their way out. They later abandoned the armored car after removing its machine guns and setting fire to what they could. In May 1921, the two main fighting units of the IRA's Dublin Brigade, the "Squad" and the "Active Service Unit", were merged following losses sustained during the Burning of the Custom House.