Louis Archambeault retired from the
Legislative Council of Quebec as representative of
Repentigny in 1888 and Horace was invited to replace him. He was originally considered a
National Conservative but switched his political allegiance to become a
Liberal. In 1897 he was appointed as speaker of the council and
Quebec's attorney general. In 1904, he introduced a bill that assigned specific statutes to industrial accidents whereby the employer would be responsible for any worker accidents even if they were not negligent. This bill would become law in 1909. In 1906, Archambeault declined an appointment to the
Supreme Court of Canada but in 1908 he accepted an appointment to the
Quebec Court of King's Bench and became its chief justice in 1911. His rulings favoured a strict reading of the text of the law. He maintained a separation of the legislative and judicial branches and thought that they should not interfere with each other, and prevented the use of
common law over
civil law. Archambeault was the administrator of the province twice, in order to act for the
lieutenant governor: December 1914 – February 1915, and February 1918 – April 1918. ==Honours==