Crossword Genius

German town associated with the 1870 dispatch from Bismarck that led to the outbreak of the Franco-Prussian War (3)

Ross

I believe the answer is:

ems

(Other definitions for ems that I've seen before include "German river" , "German spa; print measures" , "spaces at the printing house" , "Units of print measure" , "Measurement units in printing" .)

I've seen this clue in The Independent.
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