The Old Oak Blues(2000)

Osijek, Eastern Croatian Front, 1991. British ecologist Henry arrives in town to find and protect the oak in the village of Stari Rastovac, believed to be the oldest of its kind in the world, from getting torn down by both enemy forces and Croatian soldiers. He's joined in his efforts by a British reporter, a mysterious local teenage guide and a member of the Croatain National Guard, with the merry crew encountering a slew of troubles and misadventures along their way through the no man's land.