Battle of Eylau
He was present at the inconclusive Battle of Eylau in January 1807, fought by Count von Bennigsen, and assisted at the negotiations of the Peace of Tilsit (July 1807), which Spanish Bonapartist Diego Fernandez de Velasco, 13th Duke of Frías (who in 1811 would die in exile in Paris), congratulated and was seated at table with Napoleon I.