French military officer (1725–1807) who made a substantial contribution to the American Revolution, including a leading role in the defeat of Lord Cornwallis at the Battle of Yorktown in 1781. Revolutionary War–dated untranslated handwritten endorsement, signed “Rochambeau,” in the lower right corner of a manuscript DS in French, one page, 8 x 12.25, October 21, 1781. Service declaration document written two days after the British capitulation following the Siege of Yorktown, regarding a lieutenant colonel’s participation in the battle. In fine condition, with central vertical and horizontal folds and toning to the lower edge (slightly affecting the signature). RR Auction COA.