In 1406, a Spainish Nobleman, Pero Nino, invaded the island with his 1,000 mercenaries, opposed by local forces made up of 3,000 men. This lead to many skirmishes, the last of which was here at the heights of Grouville, and is marked to this day by La Croix de la Bataille, the ancient cross at the top of Grouville hill. The battle was so fierce, blood ran down this road and to the sands, staining it red, giving to the name, blood hill. By now, both sides were exhausted, and Pero Nino and his men realised that they could not be victorious in capturing Gorey Castle, and a truce was drawn up. Jersey agreed to pay a ransom of 10,000 gold crowns, release all French prisoners, and pay a tribute for the next 10 years of 12 lances, 12 axes, 12 bows and 12 trumpets, which they much resented and found very humiliating. In actual fact this was only paid once.
Note, the road is relatively quiet and there is place to leave your car short term while you search for the cache. Else there are lots of nice walks around the area or you can access by bike too, but it is a steep hill.