Na sluaig na saiget segair.

Na sluaig na saiget segair.

(the * armies * that not * attack * is/are attacked)

Armies that don't attack are attacked.

In other words, "offense is the best defense". This proverbial advice appears as a line of verse in "Bóroma", in "Silva Gadelica" (381.17). For other versions, see DIL S 21.69-72.