Monte Cassino. Due to its historical significance, German Field Marshal Kesselring ordered his forces to keep out of the abbey, despite its excellence as an observation post (then informed both Vatican and 'Allies'). But US forces used heavy bombing and levelled it anyway, their stated reason that German accuracy in battle could only be explained by its occupation. It was later determined that they had NOT occupied it after all. The bombings also killed over two hundred local civilians.