Tschudi's continues that Tell was being carried in Gessler's boat to the dungeon in the castle at Küssnacht when a storm broke on Lake Lucerne, and the guards were afraid that their boat would sink. They begged Gessler to remove Tell's shackles so that he could take the helm and save them. Gessler gave in, but Tell steered the boat to a rocky place and leaped out. The site is known in the "White Book" as the "Tellsplatte" ("Tell's slab"); it has been marked by a memorial chapel since the 16th century. Tell ran cross-country to Küssnacht with Gessler in pursuit. Tell assassinated him using the second crossbow bolt, along a stretch of the road cut through the rock between Immensee and Küssnacht, which is known as the "Hohle Gasse." Tell's act sparked a rebellion, which led to the formation of the Old Swiss Confederacy. According to Tschudi, Tell fought again against Austria in the 1315 Battle of Morgarten. Tschudi also has an account of Tell's death in 1354, according to which he was killed trying to save a child from drowning in the Schächental River in Uri.