According to legend, an outbreak of bubonic plague devastated Bavaria during the Thirty Years' War (1618–1648). Bad Kohlgrub was so depopulated that only two married couples remained alive. The village of Oberammergau remained plague-free until 25 September 1633, when a man named Kaspar Schisler returned home after working in the nearby village of Eschenlohe. Over the next 33 days, 81 villagers would die, half of Oberammergau's population. On 28 October 1633, the villagers vowed that if God spared them from the plague, they would perform a play every 10 years depicting the life and death of Jesus. Nobody died of plague in Oberammergau after that vow, and the villagers kept their word to God by performing the passion play for the first time in 1634.