On this day, 21 August 1944, the Paris insurrection took place, during which more than 4,000 Spanish exiles took up arms against the occupying Nazi regime in the battle to liberate the capital. Exiled Spanish civil war veterans were also the first external anti-fascist troops to enter the city.
This is a short history of Spanish involvement in the French resistance: https://libcom.org/history/articles/spanish-resistance-in-france-1939
Pictured: Spanish maquis in France https://www.facebook.com/workingclasshistory/photos/a.296224173896073/2062602860591520/?type=3