A British officer captured during World War I was granted leave to visit his dying mother on one condition - that he return, a historian has discovered. And Capt Robert Campbell kept his promise to Kaiser Wilhelm II and returned from Kent to Germany, where he stayed until the war ended in 1918.

Historian Richard van Emden told the BBC that Capt Campbell would have felt a duty to honour his word. It also emerged that Capt Campbell tried to escape as soon as he returned.

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