This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionLa División del Norte 2320.jpg
Español: Tropas de la División del Norte en sus posiciones con artillería de cañones, la foto fue tomada en un punto al noroeste de la ciudad de Chihuahua, el Cerro Grande se eleva prominente al fondo.
Date
between 1913 and 1917
date QS:P,+1913-00-00T00:00:00Z/8,P1319,+1913-00-00T00:00:00Z/9,P1326,+1917-00-00T00:00:00Z/9
This work is in the public domain in Mexico for one of the following reasons:
Its author died before 1952 (Mexico had a term of 30 years after the author's death until 1982,[1] and no copyright term extension in 1982 or later restored copyright to expired works).
It is an artistic or literary work published before 1918 (Mexico had a term of 30 years since publication until 1948).[2]
It is a work of a Mexican government (federal, state, or municipal) and it was published before more than 100 years ago (before 1 January 1925).[3]
Anonymous works are considered in the public domain until the author or the owner of the rights are identified.[4]