All through the Rocky Mountains, except in what we have called the northeastern triangle, this system of human slavery extended, and it had obtained such a root that it was very hard to extirpate. In Colorado it was brought to a summary end, so far as white slaveholders were concerned, in 1865, through the efforts of the government. Indian Agent Head, accompanied by Deputy Marshall E. R. Harris, visited all owners of Indian slaves and informed them that they must be released. Says Mr. Head, "I have notified all the people here that in future no more captives are to be purchased or sold, as I shall immediately arrest both parties caught in the transaction. This step, I think, will at once put an end to the most barbarous and inhuman practice which has been in existence with the Mexicans for generations.