In 1668, Marquette was moved by his superiors to missions farther up the Saint Lawrence River in the western Great Lakes region.
That year he helped Druillettes found the mission at Sault Ste.
Marie in present-day Michigan.
Other missions were founded at St. Ignace in 1671 (St. Ignace Mission) and at La Pointe on Lake Superior in present-day Wisconsin.
At La Pointe, he encountered members of the Illinois tribes, who told him about the important trading route of the Mississippi River.
They invited him to teach their people, whose settlements were mostly farther south.
Because of wars between the Hurons at La Pointe and the neighboring Lakota people, Marquette left the mission and went to the Straits of Mackinac; he informed his superiors about the rumored river and requested permission to explore it.

Leave was granted, and in 1673 Marquette joined the expedition of Louis Jolliet, a French-Canadian explorer.
They departed from St. Ignace on May 17, with two canoes and five voyageurs of French-Indian ancestry.
 They sailed to Green Bay and up the Fox River, nearly to its headwaters.
From there, they were told to portage their canoes a distance of slightly less than two miles through marsh and oak plains to the Wisconsin River.
Many years later, at that point the town of Portage, Wisconsin was built, named for the ancient path between the two rivers.
From the portage, they ventured forth, and on June 17 they entered the Mississippi near present-day Prairie du Chien, Wisconsin.

The Joliet-Marquette expedition traveled to within 435 miles (700 km) of the Gulf of Mexico but turned back at the mouth of the Arkansas River.
By this point they had encountered several natives carrying European trinkets, and they feared an encounter with explorers or colonists from Spain.
They followed the Mississippi back to the mouth of the Illinois River, which they learned from local natives provided a shorter route back to the Great Lakes.
They reached Lake Michigan near the site of modern-day Chicago, by way of the Chicago Portage.
In September, Marquette stopped at the mission of St. Francis Xavier, located in present-day Green Bay, Wisconsin, while Jolliet returned to Quebec to relate the news of their discoveries.

Marquette and his party returned to the Illinois territory in late 1674, becoming the first Europeans to winter in what would become the city of Chicago.
As welcomed guests of the Illinois Confederation, the explorers were feasted en route and fed ceremonial foods such as sagamite.
In 1668, Marquette was moved by his superiors to missions farther up the Saint Lawrence River in the western Great Lakes region. That year he helped Druillettes found the mission at Sault Ste. Marie in present-day Michigan. Other missions were founded at St. Ignace in 1671 (St. Ignace Mission) and at La Pointe on Lake Superior in present-day Wisconsin. At La Pointe, he encountered members of the Illinois tribes, who told him about the important trading route of the Mississippi River. They invited him to teach their people, whose settlements were mostly farther south. Because of wars between the Hurons at La Pointe and the neighboring Lakota people, Marquette left the mission and went to the Straits of Mackinac; he informed his superiors about the rumored river and requested permission to explore it.
Leave was granted, and in 1673 Marquette joined the expedition of Louis Jolliet, a French-Canadian explorer. They departed from St. Ignace on May 17, with two canoes and five voyageurs of French-Indian ancestry.  They sailed to Green Bay and up the Fox River, nearly to its headwaters. From there, they were told to portage their canoes a distance of slightly less than two miles through marsh and oak plains to the Wisconsin River. Many years later, at that point the town of Portage, Wisconsin was built, named for the ancient path between the two rivers. From the portage, they ventured forth, and on June 17 they entered the Mississippi near present-day Prairie du Chien, Wisconsin.
The Joliet-Marquette expedition traveled to within 435 miles (700 km) of the Gulf of Mexico but turned back at the mouth of the Arkansas River. By this point they had encountered several natives carrying European trinkets, and they feared an encounter with explorers or colonists from Spain. They followed the Mississippi back to the mouth of the Illinois River, which they learned from local natives provided a shorter route back to the Great Lakes. They reached Lake Michigan near the site of modern-day Chicago, by way of the Chicago Portage. In September, Marquette stopped at the mission of St. Francis Xavier, located in present-day Green Bay, Wisconsin, while Jolliet returned to Quebec to relate the news of their discoveries.
Marquette and his party returned to the Illinois territory in late 1674, becoming the first Europeans to winter in what would become the city of Chicago. As welcomed guests of the Illinois Confederation, the explorers were feasted en route and fed ceremonial foods such as sagamite.
Jacques Marquette