Definition of propaganda
1.capitalized : a congregation of the Roman curia having jurisdiction over missionary territories and related institutions.

2: the spreading of ideas, information, or rumor for the purpose of helping or injuring an institution, a cause, or a person.

3: ideas, facts, or allegations spread deliberately to further one's cause or to damage an opposing cause
also : a public action having such an effect.

And the anti-French/Napoleon propaganda produced by the British during the period was nearly pure hyperbole.

The History of Propaganda
Propaganda is today most often used in reference to political statements, but the word comes to our language through its use in a religious context. The Congregatio de propaganda fide (“Congregation for propagating the faith”) was an organization established in 1622 by Pope Gregory XV as a means of furthering Catholic missionary activity. The word propaganda is from the ablative singular feminine of propogandus, which is the gerundive of the Latin propagare, meaning “to propagate.” The first use of the word propaganda (without the rest of the Latin title) in English was in reference to this Catholic organization. It was not until the beginning of the 19th century that it began to be used as a term denoting ideas or information that are of questionable accuracy as a means of advancing a cause.

And don't forget, Great Britain used to be Roman Catholic...