Only from external, extended universe sources (RPG sourcebooks, etc).
According to The Phantom Menace film, Padme says there was never hostilities between Humans and Gungans when speaking with Boss Nass. Boss Nass does not refute this statement.
This sentiment was also reflected on starwars.com at the time of the movies release.
The 2001 video game Star Wars: Galactic Battleground was originally going to have levels about a war between the Humans and the Gungans, but the creative team was informed directly by LucasFilm that no such war ever took place. So the developers changed it to a Gungan civil war instead.
It was not until many years later that new sources began to popup that contradicted the original claim that Humans and Gungans were always peaceful (except for one RPG sourcebook in 2000).
Only from external, extended universe sources (RPG sourcebooks, etc).
According to The Phantom Menace film, Padme says there was never hostilities between Humans and Gungans when speaking with Boss Nass. Boss Nass does not refute this statement.
This sentiment was also reflected on starwars.com at the time of the movies release.
The 2001 video game Star Wars: Galactic Battleground was originally going to have levels about a war between the Humans and the Gungans, but the creative team was informed directly by LucasFilm that no such war ever took place. So the developers changed it to a Gungan civil war instead.
It was not until many years later that new sources began to popup that contradicted the original claim that Humans and Gungans were always peaceful (except for one RPG sourcebook in 2000).