Zoltán Fábri - A Pál-utcai fiúk aka The Boys of Paul Street (1969)

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The film originated from a novel created by the Hungarian writer Molnar Ferenc in 1906.
The book was chosen as a class reader in Hungary for children aged 11.

About the book from Wikipedia:
"The book has earned the status of the most famous Hungarian novel in the world. It has been translated into many languages and in several countries (like the UK and Italy) it is a mandatory or recommended reading in schools. Ernő Nemecsek is now ranked there among the eternal heroes of youth literature like Oliver Twist or Tom Sawyer. The novel can be easily read in most parts of the world as if its story could have happened anywhere and in any age."

User comment on the film at IMDB:
"A superbly crafted film. Ferenc Molnar's play, set in early 20th century's Budapest, is masterfully re-created in this motion picture. It depicts a soothingly naive pre-first war world, when comradeship and honor were still known words. A group of boys fight to keep their playground. But don't let such a simple plot mislead you: This is a very serious and moving film: It displays a world about to deep dive into its first global war, when all naivety would be replaced by evil and malice. "