Sir Tasker Watkins, from Nelson in Caerphilly county borough, won the Victoria Cross for his heroism in the battle for Normandy in August 1944.
He died in 2007 - but 10 years ago, on the 60th anniversary of the D-Day landings, he gave ITV Wales his only television interview about his role in the Second World War, and what the VC meant to him.
Taffy's War is being shown at 10.35pm tonight on ITV Cymru Wales - to mark the 70th anniversary of D-Day.
Watch the programme here:
Read our presenter Jonathan Hill's thoughts on interviewing Sir Tasker Watkins VC:
When people ask me about all the famous people I have interviewed over the years one in particular will always stand out. In 2004 Sir Tasker Watkins was Wales' only living recipient of Britain's highest military honour, the Victoria Cross. He had never spoken about his actions in August 1944, but he eventually agreed to speak to ITV Wales.
Although not large in stature, he was a giant of a man whose selfless actions saved the lives of his men in a murderous battle involving hand-to-hand fighting against the Germans.
He agreed to meet us on the village green in Llandaff for 20 minutes, with the understanding that he would not go into details about his heroics but he would talk in general terms. In the end he spoke wonderfully about how being awarded a VC had changed his life.
But he was more interested to know from us whether we had managed to contact any of his old comrades. He would not even mention the location of his heroics.
It was a very humbling experience to be in the presence of a real living hero who was so modest about his courageous actions all those years ago. It was an experience I will never forget and still moves me to this day.