The "comrades who sacrificed their lives" does not refer to the expeditionary force of that year, but to the pyrotechnics master who unfortunately died during the filming, as well as the extras who were injured when the covered bridge collapsed.
Because there were two serious accidents during the filming, this film was very difficult to shoot. It is a miracle that it was completed. In order to commemorate them, this sentence was added.
The story of "Leader" is not a true story, but extracted from historical facts. Historical background: The historical events are all real, but the characters, place names, and battles did not really exist.
As for the fact that "all the names of the author's real friends are used", this is Lan Xiaolong's habit. He has been like this since the soldiers attacked.