In 1757, he was elected as a town clerk in Hingham, a position that he held for the next twenty years of his life. He actively participated in militia during the French and Indian War.
In 1763, he was promoted to the rank of a major. Over the next two years, he was elected as the town selectman of Hingham, a position that he continued to hold for a period of six years.
In 1770, he put forward the measures towards non-importation of British goods and also voiced his opinion against the Boston massacre.
In 1772, he was promoted as the lieutenant colonel of the 3rd Regiment of the Suffolk militia. That year, he was elected as a representative of the town to the provincial assembly.
In 1774, the provincial assembly reformed to become the Massachusetts Provincial Congress. He continued to be elected to this body and took the role of managing militia organization and supply.
In 1776, he was promoted to the rank of the major general of the Massachusetts militia, which assigned him the duty of managing coastal defences. The same year, he successfully commanded the last of the Royal Navy ships from Boston Harbor.
In September 1776, he was commissioned to command a brigade of militia that was sent on mission to join forces with General George Washington in New York. His brigade reached southwestern Connecticut, after which he was given new orders to bring them to join Washington's army which was heading towards the north.
On February 14, 1777, he was appointed as the major general in the Continental Army, after General Washington was impressed with him. He led his brigade to Bound Brook, New Jersey, facing a surprise attack.
He was defeated in the Battle of Bound Brook, where he was countered by a much larger force. This risky mission could have also lead to his capture, an incident that he narrowly escaped.
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In September 1777, during the Battles of Saratoga, he commanded his forces, injuring himself in the process. His participation resulted in John Burgoyne's surrender of a British army.
In 1780, he was forced to surrender more than 5,000 men to Lieutenant General Sir Henry Clinton during the Battle of Charleston. It was one of the worst defeats of the Continental Army and Benjamin Lincoln was taken as a prisoner of war.
In November 1780, he was exchanged for the British Major General William Phillips. He rejoined the Washington’s main army and and played a crucial role in the Siege of Yorktown and the surrender of Lord Cornwallis on October 19, 1781.
In 1781, he was appointed as the first Secretary of War in George Washington's administration. He was appointed by the Confederation Congress under the Articles of Confederation.
In 1787, as a member of the Massachusetts state convention, he ratified the United States Constitution. The same year, he ended the Shays' Rebellion, a farmers uprising.
He served as Lieutenant Governor of Massachusetts and as the Collector of the Port of Boston, before he retired from public life in 1809.
Personal Life & Legacy
In 1756, at the age of 23 he married Mary Cushing. She was the daughter of the Elijah Cushing of Pembroke, Massachusetts. The couple had eleven children, out of which seven survived till adulthood.
He served as the trustee of the Derby Academy
He died at the age of 77 in Hingham, Massachusetts, U.S. He was laid to rest at the Old Ship Church in Hingham.
In 1972, his home, the ‘General Benjamin Lincoln House' was declared a National Historic Landmark and was enlisted in the National Register of Historic Places.