The article is dedicated to the Huguenot military leader of the times of the Religious Wars in France, the Breton nobleman François, seigneur de La Noue, one of the legendary captains of the 16th century. In the 1570s captain de La Noue considered by his contemporaries as a successor to the traditions of honor and noble qualities of the knight Bayard. He actively fought, including on the side of the Flemish Protestants in their struggle against Spanish rule. Based on a study of correspondence and movements of the La Noue military camp in the fall of 1579, the authors reconstruct the historical context around the captain's unknown autograph of November 1579, stored in the funds of the Scientific and Historical Archive of St. Petersburg Institute of History, as part of the manuscript collection of Nikolay P. Likhachev, offering their own version of the dating of this undated document. The autograph is a letter of guarantee protecting the inhabitants of the village of Bondieu / Bondues and aimed at ensuring the unhindered supply of food products to the cities of Flanders/Netherlands, controlled by the by the States General.