One of the most high-profile UDA attacks came in October 1993 , when three masked men attacked a restaurant called the Rising Sun in the predominantly Catholic village of Greysteel , County Londonderry , where two hundred people were celebrating Halloween . The two men entered and opened fire . Eight people , including six Catholics and two Protestants were killed and nineteen wounded in what became known as the Greysteel massacre . The " UFF " claimed the attack was in retaliation to the IRA 's Shankill Road bombing , which killed nine people seven days earlier
Shankill Road bombing
Shankill Road bombing
Ulster Defence Association