A viable historic device was found during excavation work at a private residence in Wexford yesterday evening.
The Army bomb disposal team were called in when the Mills type grenade was discovered outside the seaside resort of Rosslare Strand.
Gardai requested the explosive ordnance disposal team when the suspect device was uncovered in Ford of Lyng.
The team arrived on scene at 4.30 pm and transported the device to an open beach area to conduct a controlled explosion.
A cordon was put in place around the area for public safety and the scene was declared safe at 4.45 pm.
The Mills type grenade is early twentieth century in origin and was utilised during the War of Independence, the Civil War and two World Wars.
This is the second call out to such a grenade in 3 days.
Members of the public who find such a device have been advised to keep a safe distance and inform the gardai.