Forts, otherwise raths or royalties, are circular ditches enclosing a little field, where, in most cases, if you dig down you come to stone chambers, their bee-hive roofs and walls made of unmortared stone. In these little fields the ancient Celts fortified themselves and their cattle, in winter retreating into the stone chambers, where also they were buried. The people call them Dane's forts, from a misunderstanding of the word Danān (Tuath-de-Danān). The fairies, have taken up their abode therein, guarding them from all disturbance. Whoever roots them up soon finds his cattle falling sick, or his family or himself. Near the raths are sometimes found flint arrow-heads; these are called "fairy darts", and are supposed to have been flung by the fairies, when angry, at men or cattle.