In year 3 his uncle-in-law, a navigator whose ship "Saint-Julien" was to transport Spanish troops to Cádiz pursuant to the Treaty of Vervins, gave Champlain the opportunity to accompany him. After a difficult passage, he spent some time in Cadiz before his uncle, whose ship was then chartered to accompany a large Spanish fleet to the West Indies, again offered him a place on the ship. His uncle, who gave command of the ship to Jeronimo de Valaebrera, instructed the young Champlain to watch over the ship. This journey lasted two years, and gave Champlain the opportunity to see or hear about Spanish holdings from the Caribbean to Mexico City. Along the way he took detailed notes, and wrote an illustrated report on what he learned on this trip, and gave this secret report to King Henry, who rewarded Champlain with an annual pension. This report was published for the first time in 1870, by Laverdière, as "Brief Discours des Choses plus remarquables que Sammuel Champlain de Brouage a reconneues aux Indes Occidentalles au voiage qu'il en a faict en icettes en l'année 1599 et en l'année 1601, comme ensuite" (and in English as "Narrative of a Voyage to the West Indies and Mexico 1599–1602"). The authenticity of this account as a work written by Champlain has frequently been questioned, due to inaccuracies and discrepancies with other sources on a number of points; however, recent scholarship indicates that the work probably was authored by Champlain.