the armistice of salonica also known as the armistice of thessalonica was signed on  september  between bulgaria and the allied powers in thessaloniki the convention followed after a request by the bulgarian government on  september asking for a ceasefire the armistice effectively ended bulgarias participation in world war i on the side of the central powers and came into effect on the bulgarian front at noon on  september the armistice regulated the demobilization and disarmament of the bulgarian armed forces