Causa Perduta (1977)
On two hills, two fortresses are located opposite each other. Two enemy armies shoot arrows and cannons. At night, soldiers from one fortress dug a tunnel into another. They captured a nearby fortress. During this time, soldiers from another fortress captured the neighboring one by air. In the morning, it became clear that they had only exchanged fortresses. The war continues.
Director: Donyo Donev
| Directing | Donyo Donev | Director |
| Art | Donyo Donev | Art Direction |
| Writing | Vladislav Budinov | Writer |
| Writing | Zlatin Radev | Writer |
| Sound | Emil Pavlov | Music |
| Sound | Emil Pavlov | Sound |
| Production | Yanaki Kitsov | Producer |
