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The general weaknesses of the League are illustrated by its specific failures.

Cieszyn (German Teschen, Czech Těšín) is a region between Poland and today's Czech Republic, important for its coal mines. Czechoslovakian troops moved to Cieszyn in 1919 to take over control of the region while Poland was defending itself from invasion of Bolshevik Russia. The League intervened, deciding that Poland should take control of most of the town, but that Czechoslovakia should take one of the town's suburbs, which contained the most valuable coal mines and the only railroad connecting Czech lands and Slovakia. The city was divided into Polish Cieszyn and Czech Český Těšín. Poland refused to accept this decision; although there was no further violence, the diplomatic dispute continued for another 20 years.