She gave birth to a third child during the journey who died within days.

The family reached Fort Astoria in February 1812.

In 1813, the Dorion family joined a trapping expedition under John Reed that established a base camp near the confluence of the Boise and Snake rivers in present-day Idaho.

In January 1814, Marie received a warning from a Shoshone informant about an impending attack on her husband’s trapping camp.

She traveled to warn Pierre.

She arrived to find him dead.