The Somme: From Defeat to Victory 2006 one on netflix

Based on diaries, records and eyewitness accounts, this is the story of the two Battles of the Somme from the perspective of British and German soldiers. It shows how the major lessons learned by the British Army leadership after the disastrous first attacks of July 1916 were turned into victory at the second attempt in September 1916, arguably the turning point for the First World War.