Rachel was born in 1780. She was the daughter of William Allen and Martha McAdoo. She had the distinction of having been born in Daniel Boone's fort in Kentucky. Boones Fort, KY may very well be Fort Boonesbourgh founded by Daniel Boone in 1775.
Her father, William, was a powder maker by occupation.
Married Robert Bird January 22, 1799 in Boones Fort, Warren County, Kentucky. Left Kentucky and moved to Walnut Grove, Tazewell County, Illinois in the fall of 1827, and lived there until 1830. In 1830 they went to Richland Township, Marshall County, Illinois where they lived until 1847, when they joined the Jordan Sawyer wagon train and went to the Oregon Territory. Mother of Elizabeth (b. Jan. 27, 1800), Mary Ellen (b. Dec. 22, 1802), Maria/Mariah (b. Jun. 3, 1805), Milton (b. Oct. 23, 1807), John (b. Apr. 13, 1810), William Allen (b. Jul. 24, 1812), Robert Jr. (b. Jun. 19, 1815), Martha Jane (Matilda) (b. Mar. 3, 1817), Elijah (b. Nov. 9, 1821), Kitty Ann (b. Mar. 9, 1822), and James (b. Aug. 7, 1823).
Rachel Bird was my great-great-great-great grandmother, and she is the reason my family is in located in Oregon today. My family and I lived within a few miles of where Rachel Bird is buried for quite a few years without knowing it until recently.
From a book from the Sons and Daughters of Oregon Pioneers, published in 1994: The emigrant train named the "Gordon Sawyer" left Lacon, Marshall Co. IL, on 27 March 1847 for Oregon. They crossed the Missouri River near St. Joseph, MO.
The train was made up of related families and neighbors and included Robert and Rachel (Allen) Bird and their sons - John, William, Eljah - and their families. Also in the train were the families of James Moore, William Larkins, Fudge, Mark Sawyer, Jordan Sawyer, a Mr. Smith, William and Samuel Bland, the Sols, Allens, Robert Kinney, The Rev. Samuel Allen (Cumberland Presbyterian minister), Avery, Crawford, and Ward, which made up about 35 able-bodied men, besides women and children and 30 wagons.
Their journey was without mishap until they reached the South Platte River when a cattle stampede occurred. William Bird had crossed the river and gone some distance when he heard someone calling him. He turned and saw Mrs. Fudge coming as fast as her one yoke of oxen could pull her light wagon. As he told it later, it was rather amusing. Mrs. Fudge was a very large, fleshy woman, and as the road was rough, she was just rolling from one side of the wagon to the other. He called back to her through his cupped hands that she had the right of way. The stampede was not serious but made for a little fun that night in camp.She passed away in 1859. 
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