In the twentieth century, the Second World War, the construction of highways, the new phenomena of forest fires Between 1968 and 1971 about 750 hectares , about a quarter of the remaining forest, burned and was replanted, in sessile oak (Q. petraea) with an understorey of beech (saplings), on poorer soils, hornbeam and Nordmann Spruce, and on the most degraded soils, red oak and chestnut.