By the morning of the 25 May, news of the long-expected outbreak of the 1798 rebellion in neighbouring County Kildare and of military losses in the battles of Ballymore-Eustace, Naas, and Prosperous had reached the garrison in Carnew, who decided to take preventative measures by assembling the rebel suspects in detention. The suspects were marched from Carnew Castle to the local handball alley and executed by firing squad (consisting of yeomanry soldiers) as a warning to the local populace.[2]