Oregon Riflemen

The Oregon Rifles was the first military force organized for the protection of Oregon Country in the northwest of North America. Shortly after the Whitman Massacre, Oregon Governor George Abernethy communicated to the legislature his concern about the seriousness of the conditions, and issued a call for volunteers. A company of 45 men, furnishing their own rifles and equipment, organized in Oregon City and arrived in The Dalles on December 21, 1847.

...
Wikipedia