Captain Jacobs was a Delaware

Lenape

The Lenape are an Algonquian group of Native Americans of the Northeastern Woodlands. They are also called Delaware Indians. As a result of the American Revolutionary War and later Indian removals from the eastern United States, today the main groups live in Canada, where they are enrolled in the...

 (Lenape) chief during the French and Indian War

French and Indian War

The French and Indian War is the common American name for the war between Great Britain and France in North America from 1754 to 1763. In 1756, the war erupted into the world-wide conflict known as the Seven Years' War and thus came to be regarded as the North American theater of that war...

. His real name was Tewea; he was called "Captain Jacobs" by a Pennsylvania

Pennsylvania

The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...

 settler who purchased land from him and thought he resembled another person by that name. He is best known as the Native American

Native Americans in the United States

Native Americans in the United States are the indigenous peoples in North America within the boundaries of the present-day continental United States, parts of Alaska, and the island state of Hawaii. They are composed of numerous, distinct tribes, states, and ethnic groups, many of which survive as...

 leader during the Kittanning Expedition

Kittanning Expedition

The Kittanning Expedition, also known as the Armstrong Expedition or the Battle of Kittanning, was a raid during the French and Indian War that led to the destruction of the American Indian village of Kittanning, which had served as a staging point for attacks by Delaware warriors against...

 in 1756. There is not a lot of background information about Jacobs, only that he was a great warrior of the Lenape, and was responsible for the multiple raids on English settlers after Braddock's defeat.
On the morning of September 8, 1756, Colonel John Armstrong led a force of three-hundred Pennsylvanians to attack the village of Kittanning in hopes of disrupting the Native's grip on the settlers.