Violence continued in the region, with three company men fatally speared in July and October 1831 and heavy losses inflicted on sheep and oxen. The population of North West clans fell from 700 to 300 through the 1820s, while in the North nation—where shepherds vowed to shoot Aboriginal people whenever they saw them—numbers had plummeted from 400 in 1826 to fewer than 60 by mid-1830. Violence ceased in 1834 but resumed between September 1839 and February 1842 when Aboriginal people made at least 18 attacks on company men and property.[50][51]