The last time bark bread was used as famine food in Norway was during the Napoleonic Wars. The introduction of the potato as a staple crop gave the farmers other crops when grain production failed. So that bark bread and moss cakes were no longer needed. In Northern Sweden, traces of Sami harvest of bark from Scots pine are known from the 1890s. In Finland "pettuleipä" (literally "pinewood-bark bread") was produced as a substitute for bread during the Finnish Civil War of 1918.