'Green fields, no barbed wire, nothing…'. Those who were there recall what it felt like to be advancing at last in the autumn of 1918, after years of stalemate. After a series of assaults on the Hindenburg line, the vast system of German trenches, many remember excitement as they advanced so far they lost contact with their command. But there were pockets of fierce resistance, and an eerie feeling as they set about reclaiming abandoned villages where snipers and booby traps might lie in waiting for them. Presented by Dan Snow Produced by Megan Jones for BBC Wales