In medieval fortification, a trou de loup (French for "wolf hole"; plural trous de loup, also commonly referred to as a tiger pit in the East) was a type of booby trap or defensive obstacle. Each trou de loup consisted of a conical pit about 2 m (6 ft 6 in) deep and 1.2 to 2 m (3.9 to 6.5 ft) wide at the top. At the bottom of the pit, a sharpened Punji stick (wooden stake) would be hammered in.[1] In some cases, the pit was concealed by light cover of wicker and a layer of soil.
In this fort were discovered pits are some of the most valuable monuments found in the redoubt.
To find the cache need to look at a nearby monument a few numbers:
Distance = (less quanity of polish soliders killed in the fort) +1
Azimuth = (greater number of Russians who died in the fort divided into 2)+1.2366
The cache is part of the series needed to find a bonus don't forget to write letter and number.