Captain Spier Spencer

From a Pre-War letter from Vincennes, dated 22 Sept. 1811:

"Captain Spencer's Company of Volunteers will act as a detached Corps and he will receive his orders from the Commander in Chief.  They are received as a Company of Volunteers."

Source

 Capt. Spier Spencer was killed in action Nov. 7th, 1811.  He commanded a company of mounted riflemen of Indiana militia in the battle.  They were called "Spencer's Yellow Jackets" because of their uniforms.

He had a brother who was killed in the same battle.

Capt. Spencer's small son went on the expedition with him and was Harrison's special care after his father's death.

Battle Of Tippecanoe From Sign At Fort Knox (II) (in the Vincennes, Indiana, area)

When she (Spencer's wife) was a child, she and her mother Delilah Tyler, and other children of the family, were stolen by the Indians and taken from Kentucky to Detroit, where they were ransomed by Major DePeyster, upon learning that Charles Polk (father of Elizabeth Polk, who was Spencer's wife) was a Mason.  The family was reunited.

Information about Captain Spier Spencer from Wikipedia:

In 1818, Spencer County, Indiana, was named for him, as was in 1820 the town of Spencer, Indiana in Owen County. Spencer County, Kentucky was created and named for him in 1824.  Spencer's widow continued operating The Green Leaf Tavern. When she married William Boone, she changed the name to the "Billy Boone Tavern". However, the marriage was short lived and she divorced Boone in 1829.