@Steven StGeorges it is. The battle of La Lys is studied in school here, it was the worst defeat of the Portuguese Army since Alcácer-Quibir, in 1578. There were many factors, but the worst was that the British on both our flanks retreated and did not inform us.
It caused the operational loss of both portuguese divisions, almost 20000 men, but also delayed the Germans, greatly contributing for the failure of the operation.
The 20000 strong Portuguese Expedicionary Force held the 55000 Germans, 8 divisions, for long enough for the reserves to close the gap behind them.
Private Milhais held, alone, behind enemy lines, with his Lewis machine gun, for four days. He helped several British and Portuguese soldiers retreat to their lines. Eventually he saved a Scottish doctor from drowning in a swamp and helped him back to the lines.
That's why he gets a movie, a guy that, in the absolute hell of WWI trench warfare holds for four days behind enemy lines and keeps saving others, deserved that and a lot more.
Instead he was one of several generations of portuguese that suffered from trauma and PTSD, unsupported, from our many wars.
Again, a good movie.