Between 1618 and 1639 it became a battleground between competing factions during the Bündner Wirren. The Protestant party was supported by France and Venice, while the Catholic party was supported by the Habsburgs in Spain and Austria. Each side sought to gain control of the Grisons to gain control over the important alpine passes. In 1618, the young radical Jörg Jenatsch became a member of the court of 'clerical overseers' and a leader of the anti-Habsburg faction. He supervised the torture to death of the arch-priest Nicola Rusca of Sondrio. In response, Giacomo Robustelli of the pro-Catholic Planta family, raised an army of rebels in the Valtellina. On the evening of 18/19 July 1620, a force of Valtellina rebels supported by Austrian and Italian troops marched into Tirano and began killing Protestants. When they finished in Tirano, they marched to Teglio, Sondrio and further down the valley killing every Protestant that they found. Between 500 and 600 people were killed on that night and in the following four days. The attack drove nearly all the Protestants out of the valley, prevented further Protestant incursions and took the Valtellina out of the Three Leagues.