This is the concluding episode in our series marking the centenary of the start of World War One.
Tonight's edition looks at the heroic efforts of the 1st Monmouths who - against all the odds - helped hold the line at the Second battle of Ypres.
It also features a tribute to Welsh air ace Ira Jones.
Click below to catch up with earlier programmes in the series
People across Wales are switching off their lights for an hour this evening and lighting a candle of remembrance.
ITV Wales correspondent Richard Morgan writes about his experience of researching the stories behind those killed in the Great War
All in one place: See some of ITV Wales's reports marking the centenary of the outbreak of the First World War here.