 The Viceroy, the Marques de Azambuja, had been warned by his home government that Britain was seeking to extend its overseas power and influence following its victory in the Seven Years' War, and therefore suspected that the observation of the transit of Venus and study of natural history that Cook told him were the aims of his voyage were not its only or main objectives.Cook took offence at the Viceroy's suspicious attitude.In his journal, he described Guanabara Bay, including its defensive fortifications, and noted that the city could be taken by a force of six ships of the line.