Zombie Lake (1981) 

In World War II, in a small village in France vanquished by the German army, a local woman has a love affair with one soldier and they have a daughter, Helena. One day, the German soldiers are ambushed and killed by the French Resistance and their bodies are thrown into a lake. Ten years later, the soldiers become an army of undead attacking the locals. The Mayor, who was part of the resistance, organizes a posse with a flamethrower, to destroy the living dead, and uses the girl Helena to help them. - IMDb


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