Grimsthorpe Castle had to call out the bomb squad on Tuesday after a live handgrenade was found in a field near the main entrance.
The rusty and soil encrusted grenade was identified as a second world war Mills grenade by the Nottingham bomb squad who carried out a controlled explosion on Tuesday afternoon. The grenade was missing the lever and pin, and was blocked with soil, but it was felt it was better to be safe than sorry.
Experts thought that the grenade had either worked its way up through the soil or had been dug up by an animal. The castle grounds were used during WWII as a training range - and was used by the paratroopers prior to Arnhem.