British ambulances in the Franco-Prussian War
Though the United Kingdom remained neutral during the Franco-Prussian War of 1870–71, it provided ambulances and other medical assistance to both combatants and the civilians affected by the war. The term "ambulance" at this time denoted a medical organisation that provided field hospitals, transport and surgical operations, not the more limited modern use.
Source: Wikipedia — British ambulances in the Franco-Prussian War (CC BY-SA 4.0)