Colonel Armstrong

Colonel Armstrong, a British Army officer awarded the Victoria Cross, is the central figure of the tragedy that drives the plot of Murder on the Orient Express. Though dead before the story begins, his fate—and the fate of his family—provides the motive for the elaborate conspiracy that results in the murder of Samuel Edward Ratchett, the man responsible for destroying his life. Armstrong is remembered by those who knew him as a brave, honorable, and beloved man, and his death, along with those of his wife and unborn child, transforms his friends and servants into a self-appointed jury of executioners.

Identity and Background

Colonel Armstrong was an Englishman who was half American, his mother having been a daughter of W. K. Van der Halt, the Wall Street millionaire. He married Sonia Armstrong, the daughter of the celebrated American tragic actress Linda Arden. The couple lived in America and had one child, a daughter named Daisy, whom they idolized. Armstrong had a distinguished military career, earning the Victoria Cross, and was widely liked and respected. Colonel Arbuthnot, who served with him in the war and was his best friend, described him as a "nice fellow" whom "everybody liked." Edward Masterman, who served as his batman during the war and later as his valet in New York, also remained loyal to him long after his death.

The Armstrong Kidnapping Case and Its Aftermath

When Daisy Armstrong was three years old, she was kidnapped by a gang led by Cassetti (later known as Samuel Edward Ratchett). The kidnappers demanded an impossibly high ransom. After the Armstrongs paid the enormous sum of two hundred thousand dollars, the child's dead body was discovered; she had been dead for at least a fortnight. The public indignation was immense. The tragedy then compounded: Mrs. Armstrong, who was expecting another baby, gave birth prematurely to a dead child following the shock of the discovery, and she herself died. Colonel Armstrong, "broken-hearted," shot himself. The case also led to the death of Susanne, the French nursemaid, who was wrongly suspected of complicity and, in despair, threw herself from a window. Cassetti was later arrested but, through the use of his enormous wealth and his hold over various persons, was acquitted on a technicality. He then changed his name to Ratchett and left America.

Relationships and the Conspiracy

Colonel Armstrong's death created a deep and lasting bond among those who had loved him and his family. His best friend, Colonel Arbuthnot, was present during the terrible days in New York and joined the conspiracy to carry out the death sentence that Cassetti had escaped. His former batman and valet, Edward Masterman, also joined the plot. The household staff—including the chauffeur Antonio Foscarelli, the nurse Greta Ohlsson, and the governess Mary Debenham—were all drawn into the plan, driven by their devotion to the Armstrongs and their grief. Linda Arden, Mrs. Armstrong's mother, played the most important role, disguising herself as the American passenger Mrs. Hubbard. The conspiracy was organized by Hector MacQueen, whose father had been the district attorney on the case, and who had adored Sonia Armstrong. The plan was to have twelve people, representing a jury, each stab Ratchett once.

Narrative Role and Significance

Colonel Armstrong never appears in the novel, but his story is the engine of the entire plot. His death, and the deaths of his wife and child, transform a simple murder mystery into a complex moral drama. The revelation of his identity and the details of the Armstrong case, which Poirot uncovers from a charred fragment of a letter, provides the key to understanding the seemingly impossible crime. The conspiracy is framed as an act of rough justice, a response to the failure of the legal system to punish a guilty man. Colonel Armstrong's legacy—as a good man destroyed by evil—is what unites the twelve conspirators and justifies, in their eyes, their act of private vengeance. His story is the emotional core of the novel, and his fate is the reason Poirot ultimately chooses to present the first, false solution to the police, allowing the conspirators to go free.