When populations were quickly decreased by causes such as the Black Death or devastating warfare ( for example, Genghis Khan's Mongol hordes in eastern and central Europe, Thirty Years ' War in Germany ), this could lead to settlements being abandoned.

When the Russians expanded into Transbaikalia ( eastern Siberia ) in 1609, the Cossacks found only a small core of tribal groups speaking a Mongol dialect called Buryat and paying tribute to the Khalkhas.

When the Mongol Yuan Dynasty was overthrown and the Ming Dynasty was established, the Tibetan lamas were expelled from the court, and this form of Buddhism was denounced as not being an orthodox path.

When a Mongol contingent entered the entrance of the fortress, the Mongol forces would be slaughtered to the last man, while trapped between 4 walls.

When the Chinese overthrew Mongol rule and established the Ming dynasty, many Mongols were castrated and turned into eunuchs.

When he conjures up a large army with his powder, the Mongol soldiers flee.

When confronted with a fortified city, the Mongol imperatives of maneuver and speed required that it be quickly subdued.

When Genghis Khan died in 1227, he left 4, 000 Mongol men to Jochi's family.

When Batu drank a cup of wine before the others at the victory banquet, Buri complained of the unfairness of Batu receiving such a vast and fertile steppe and the Mongol army, and, along with Guyuk and others, ridiculed Batu as an old woman with beard.

When the Great Khatun Toregene invited him to elect the next Emperor of the Mongol Empire, Batu announced his inability to attend any immediate kurultai, thus delaying the succession for several years.

When Michael of Chernigov, who had murdered the Mongol envoy in Kiev earlier, arrived the Mongol overseers were engaged in taking a census of the inhabitants for the poll tax.

When the Rebellion of the Three Feudatories erupted in 1673, the Chahar Mongol prince revolted against the Qing Dynasty.

When the western flank of the Mongols plundered Polish cities, a European alliance between the Poles, the Moravians, the Christian military orders of the Hospitallers, Teutonic Knights and the Templars assembled sufficient forces to halt, although briefly the Mongol advance at Legnica.

When Mongke's mother Sorghaghtani and their cousin Berke organized a second kurultai on July 1, 1251, the assembled throng proclaimed Mongke Great Khan of the Mongol Empire.

When Hulagu headed further west, the Armenians from Cilicia, the Seljuks from Rum and the Christian realms of Antioch and Tripoli submitted to Mongol authority, joining the Mongols in their assault against the Muslims.

When Ghazan took the throne of the Ilkhanate in 1295, he formally accepted Islam as his own religion, marking a turning point in Mongol history after which Mongol Persia became more and more Islamic.

When Bulgaria became a Mongol vassal, the reputation of Vladislav decreased, and the Serbian nobles once again began to protest.

When Subutai heard in 1242 that Grand Khan Ögedei had died the previous year, the Mongol army retreated eastward, because Subutai had three princes of the blood in his command and Genghis Khan had made clear that all descendants of the Khagan ( Grand Khan ) should return to the Mongol capital of Karakorum for the kurultai which would elect the next Khagan.

When King Hetoum returned, he paid a large ransom to retrieve his son, including a large quantity of money, handing over several fortresses, and accepting to intercede with the Mongol ruler Abagha in order to have one of Baibars's relatives freed.

When Mongol troops invaded Song China, the young Emperor fled to the area around Guangdong Province and Hong Kong.

When Trajan acceded to the purple he chose to follow his predecessor's example, adopting Hadrian as his own heir, and the practice then became the customary manner of imperial succession for the next century, producing the " Five Good Emperors " and the Empire's period of greatest stability.

When Timur invaded Asia Minor, his army of horsemen with no infantry allowed him to move fast through the Turkish Empire, destroying the Empire's defense piece by piece.

When exposed to individuals from the normal universe, the Terran Empire began to reform itself for the better but was overthrown in the 24th century as a consequence and replaced with an equally barbaric Alliance of several alien species who took advantage of the Empire's self-weakening to enslave their former masters.

When the great port city of Marienburg lay within the Empire's borders, it was part of the province of Westerland, at the mouth of the river Reik.

When Empire's label cut back on its bands, many of the DHR groups folded, but D ' Orio and Trost kept going.

When the Soviets eventually pull out and when the Eastern Bloc begins to collapse in the late 1980s, both groups believe they are the primary architects of the " Evil Empire's " defeat.

When the Machine Empire's forces unearthed Zedd's Serpentera to destroy Earth, Carter teamed up with nine other Red Rangers and traveled to the moon to stop them in the Wild Force episode " Forever Red.

When nationalism spread into Anatolia, with Armenians demanding equal rights and pushing for autonomy, the Ottoman leadership believed that the Empire's Islamic character and even its very existence were threatened.

When in 1346 King Charles IV united the rule over Bohemia and Germany in his hands, he established the Lands of the Bohemian Crown, which remained beyond the Empire's suzerainty and were not considered Imperial States.

When the Sikh Empire's attention turned towards Kashmir, they encountered the other formidable Janjua branch of the Khakha Janjua warlords, renowned as the most troublesome tribe of Kashmir.

When Yang finally meets his sworn brother Guo Jing, the latter attempts to persuade him to take the Song Empire's side.

When the pre-existing Turkish ghazis were incorporated into the Ottoman Empire's military they became known as " akıncı.

When the negotiations began, his quarrel with the king of France was temporarily in abeyance, and he had no intention of reviving it so long as there was hope that French money would come to pay the troops who, under Charles of Valois, the papal vicar of Tuscany, were so valuable in the crusade against the Colonna cardinals and their Sicilian allies.

When King Andrew II, having fulfilled his Crusader vow, took his troops northward, he proceeded through Armenian Kingdom of Cilicia.

When it fell to the British Raj, the fort was dismantled on the orders of Lord William Bentinck and was converted into a sanatorium for the British troops stationed at the garrison town of Nasirabad.

When the latter was surrounded by Umayyad troops, he sued for help to Ibn Hafsun, but the latter was defeated by the besiegers and returned to Bobastro.

When the end came, these troops simply shifted their allegiances to the new barbarian rulers.

When this was rebuffed he made an attempt to cross back to Italy to collect his missing troops but was turned back by a storm.

When Chiang was defeated by CPC forces in mainland China in 1949, he retreated to Taiwan with his government and his most disciplined troops, along with most of the KMT leadership and a large number of their supporters ; Chiang Kai-shek had taken effective control of Taiwan at the end of WWII as part of the overall Japanese surrender, when Japanese troops in Taiwan surrendered to Republic of China troops.

When Hernando Pizarro and his army returned, Almagro's troops quickly defeated them and took the Pizarro brothers Hernando and Gonzalo captive.

When the settlers protested his language Allen continued the tirade, threatening to send any troops from New York to Hell.

When the conflict began, Lenin tried to commit the army on behalf of Red Finland, but the troops were demoralized, war-weary and home-sick after years of World War I.

When US troops withdew from Grenada in December 1983 Nicholas Braithwaite of the National Democratic Congress was appointed Prime Minister of an interim administration by the Governor General Sir Paul Scoon until elections could be organised.

When fighting troops of industrialized nations, Gatling guns could be engaged by artillery they could not reach and their crews could be targeted by snipers they could not see.

When not campaigning he would travel the province hearing complaints and recruiting new troops.

When a dispute between the capetanei of Laconia and the appointed governor of the province escalated into an armed conflict, he called in Russian troops to restore order, because much of the army was controlled by capetanei who were part of the rebellion.

When Hindal withdrew from protecting the rear of Humayun's troops, Sher Shah's troop quickly reclaimed these positions, leaving Humayun surrounded.

When Chilean troops occupied Lima during the War of the Pacific in 1881, they put in charge certain Patricio Lynch, whose grandfather came from Ireland to Argentina and then moved to Chile.

When Kolberg was part of Brandenburgian Pomerania during the Early Modern Age, it withstood Polish and Napoleon's troops in the Siege of Kolberg.

When Japan surrendered, Lao nationalists declared Laos independent, but by early 1946, French troops had reoccupied the country and conferred limited autonomy on Laos.

When Mieszko II was busy defending Lusatia from the troops of Conrad II, the Kievan expedition started from the east with Yaroslav I the Wise as a leader.

When British troops attempted to seize Buenos Aires in 1806, the attack was repulsed by the city's residents, not by Spain.

When government troops fired on a mob of League students demonstrating in front of the Government Palace in October 1931, the Liberal administration of President José Guggiari lost what little legitimacy it retained.

When Franco ordered Paraguayan troops to abandon the advanced positions in the Chaco that they had held since the 1935 truce, the army revolted in August 1937 and returned the Liberals to power.

When Clement II died in October 1047, Benedict seized the Lateran Palace in November, but was driven away by German troops in July 1048.