There were two major battles at Torreón, not including Villa’s original taking of the city on May 15, 1911.
The First Battle of Torreón was fought on September 29, 1913, when Villa recaptured Torreón from federal forces.
The Second Battle of Torreón took place from March 26 to April 2, 1914, with Villa once again the victor after driving off a 10,000 strong federal garrison.
It is unclear which specific battle is being referred to in the novel.
Los Alegres De Teran – La Toma De Torreon (The Taking of Torreón)