Hi the Military had a rifle range at Dollymount. Most of these camps had Nissan Huts It would be a simple matter to put wire around it if not already there and put up extra huts. A famous event took place out there The world rifle competitions were held out there. The U S A developed a rifle to take on the Irish. The trophy of which was found at bisley England. The range was at least 1,000 yds long. That was the distance this competition was fired at, As far as I know they fired from the main land out toward the island.