The IRA is divided into cells. There are so many cells per county. Cavan, being on the Irish border, means that members of the IRA in that county can travel to Enniskillen for a night's drinking. One night, a member of the Fermanagh cell saw the men from Cavan and gave them a one word message " tracks ". This grim message meant that the British army and police were stopping all traffic and searching houses in the immediate locality.