Mont. Code Ann. § 70-29-112
The defendants who have been personally served with the summons and a copy of the complaint or who have appeared without such service must set forth in their answers, fully and particularly, the origin, nature, and extent of their respective interests in the property, and if such defendants claim a lien on the property by mortgage, judgment, or otherwise, they are deemed to have waived their right to such lien unless they state:
History: En. Sec. 498, p. 141, Bannack Stat.; amd. Sec. 270, p. 191, L. 1867; re-en. Sec. 319, p. 98, Cod. Stat. 1871; re-en. Sec. 370, p. 141, L. 1877; re-en. Sec. 370, 1st Div. Rev. Stat. 1879; re-en. Sec. 383, 1st Div. Comp. Stat. 1887; amd. Sec. 1349, C. Civ. Proc. 1895; re-en. Sec. 6892, Rev. C. 1907; re-en. Sec. 9525, R.C.M. 1921; Cal. C. Civ. Proc. Sec. 758; re-en. Sec. 9525, R.C.M. 1935; R.C.M. 1947, 93-6310.