In 1869, the government of John A. Macdonald, made plans to create a 200-strong mounted police force to maintain order along the border; such a force, he thought, would enable the colonization of the region and be much cheaper than deploying regular militia units for the task. The implementation of this proposal was delayed, however, first by the rebellion of the Métis, and then by the threat of a Fenian invasion. Meanwhile, a survey conducted in 1871 by Lieutenant William Butler recommended establishing a mounted force of up to 150 men under a magistrate or commissioner, based along the northern trade routes, leaving the border area as a liminal, ungarrisoned zone. Colonel Patrick Robertson-Ross conducted another survey in 1872, and recommended an alternate strategy of recruiting a larger force of 550 men who would be tasked to push south into the border region itself and establish law and order there.