William Smith confronted his brother Joseph, accusing him of always carrying out his planned course, "whether right or wrong." William tried to justify his "treating the authority of the Presidency with contempt." He then resigned his eldership in the Church and made public exclamations against his brother Joseph.
[LDS Church History Vol II, pp. 296-297; cf. Frost statement, in Broadhurst, Dale R., Mormon Chronology, http://olivercowdery.com/history/morchrn2.htm]