On June 25, 1831, Gaines sent troops to Vandruff Island across from Saukenuk. The island had been named for a farmer and trader who operated a ferry, as well as sold liquor to the natives, which had previously prompted a raid by Black Hawk to destroy the whiskey. This time, underbrush had grown to impede the militiamen from landing, so the next day the militia tried to assault Saukenuk itself, only to find that Black Hawk and his followers had abandoned the village and recrossed the Mississippi. On June 30, Black Hawk, Quashquame, and other Sauk leaders met with Gaines and signed an agreement in which the Sauks promised to remain west of the Mississippi and to break off further contact with the British in Canada.