However, with the assassination at Sarajevo of the crown prince of the Empire of Austria - Hungary on June 28, 1914, a dark cloud appeared on the horizon. A month later, Emperor Franz Josef declared war on Serbia and then ordered his troops to invade that kingdom.
परन्तु, सारायेवो में जून २८, १९१४ को आंस्ट्रिया - हंगरी साम्राज्य के युवराज की हत्या हो जाने के कारण क्षितिज पर एक अन्धकारमय बादल दिखने लगा ।