How does the author use foreshadowing in The Four Horsemen of the Apocalypse?

Ibáñez narrates the fourth chapter in the past tense in order to show the reader how the Desnoyers family became what it is, and how they came to be in Paris. Marcelo fled from military service when he left his country in 1870. This fact is important, because it foreshadows not only the reasons why Marcelo did not return to his country in his youth, but a time when Marcelo will regret his choice.