Fred Dixon established trading post with Indians on river front near present park. 1811 Indian Massacre at O'Neill home two miles north of town.
Settlers flee, come back when war ends.
1814 Gen. William Clark led expedition to Prairie DuChein, taking 200 men. Camped at Clarksville. Town later named for him. 1818 James Fielder started mercantile business. 1820 John Carter started General Store.