Rachel Ward

Sean Garlick

Elaine Cusick

Laurie Moran

Marc Aden Gray

Ray Chubb

Bradley Meehan

Rebecca Rigg

Beth Buchanan

Anna Crawford

Richard Terrill

Vernon Wells

Peter Hehir

David Bradshaw

Roger Stephen

Wendy Playfair

Ed Turley

Nick Waters

Terence Donovan

Asher Keddie

Ralph Strait

Danny Beckermann

Philip Warner

Nicholas McCallum

Arch Nicholson

Gabrielle Lord

David Connell

Everett De Roche

Ian Crawford

Terry Stapleton

Hector Crawford

Raymond Menmuir

Helen Watts

Michael Lake

Hilary Dwyer

Drama

Horror

Thriller

Fortress

Crawford Productions

Australia

One might view this as the polar opposite of "Lord of the Flies", although both give very credible depictions of kids in dire circumstances.
The difference here is that there is a teacher with the kids to guide them.
Also, there is no plane crash. Instead, the kids are kidnapped from a very remote school in a very remote place in Australia.
There are a lot of very interesting aspects to this film. First of all, the protagonists of a beautiful female teacher and her students in a place so remote that all the grades and ages are combined in one tiny class, so we get older kids and younger kids. 
Then there are the antagonists, the four kidnappers. They wear masks. One, Father Christmas, is super dangerous. Another, the mouse, is also quite dangerous. The other two have their own problems. "Kitty cat" appears to be someone who might today be on a "sexual predator" list, and the duck is the most reluctant of the group.
Instead of "spoiling" the stroy, I'll leave it at this to let you go through the adventure, and there are lot of adventures that the protagonists go through. 
The reason I say it is the polar opposite of "Flies" is that instead of behaving horrible to each other, they work together to try to survive against the maniac who torments them.

English

Fortress 1985 Movie Trailer