The manuscript is an autograph letter written in the hand of Trophime Gérard de Lally-Tolendal. It delves into the trial of Thomas-Arthur de Lally and Voltaire’s role in it, particularly through his historical work Précis du siècle de Louis XV (1768). Within, the author meticulously outlines the accusations levelled against Thomas-Arthur de Lally, recounts the events of the Seven Years’ War (1756–1763) and the consequential Battle of Wandiwash (1760), and sheds light on the disloyalty and envy among Thomas-Arthur de Lally’s fellow officers, which significantly contributed to his adverse circumstances. Additionally, the letter references Lettres des Indes à l’auteur du Siècle de Louis XIV (Amsterdam [Paris] [1770].