Agreements between local authorities , armed fighting and an ettempted plebiscite proved inconclusive .
In 1920 the Council of Ambassadors settled the matter at the Spa Conference by awarding Zaolzie to Czechoslovakia .
Agreements between local authorities , armed fighting and an ettempted plebiscite proved inconclusive and in 1920 the Council of Ambassadors settled the matter at the Spa Conference by awarding Zaolzie to Czechoslovakia .