[1] LeBreton traveled to Oregon in 1840 aboard the vessel Maryland of Captain John H. Couch, an early sea merchant in Portland.
[2][3] On 18 February 1841, he was elected as the recorder for the Champoeg Meetings and for the probate court that was created.
[1] In 1843, when the provisional government was formed, he was again elected as the recorder, the forerunner to the office of Secretary of State.
A group of settlers, led by LeBreton tried to capture Cockstock, a Molala man.
In the aftermath a militia unit called the Oregon Rangers was formed.