Ardennes - S1.E6

The team are in the Ardennes, where at the site of The Battle of the Bulge, Paul's thermal imaging camera appears to pick up on a heat signature of a long dead German soldier hiding in a foxhole. Later they investigate a medieval castle in La Roche-en-Ardenne which is said to be haunted by numerous ghosts. The night takes a frightening turn when they are pelted with stones from an abandoned tower. But there's no one there. Is this evidence of a malevolent presence who wants the team to leave?