According to the Ottoman Rumi calendar, 31 March Incident actually occurred on 13 April 1909.
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The countercoup attempted to put a temporary end to the nascent Second Constitutional Era in the Ottoman Empire and to the newly established influence of the Committee of Union and Progress, in order to re-affirm the position of the Sultan Abdulhamid II as absolute monarch.
After the Young Turk Revolution during the Second Constitutional Era Sandanski was also founder and leader of one of the left political parties in Ottoman Macedonia - Peoples' Federative Party (Bulgarian Section), which headquarter was in Solun.