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Rejoining Jebe on the Don, Subedei recruited 5,000 Brodniki (nomad fishermen on the lower Don) as mercenaries and then proceeded to the Dniester where his troops patrolled for several months, while his Mandarin scholars made maps of southern Russia and organized all information from their intelligence sources. Their reconnaissance then complete, they started eastward to go home. As they did so, however, spies brought in word that around and behind them the remnants of the Cumans had accumulated a new army, including forces from various Russian principalities. Greatly outnumbered, the Mongols could have easily outrun the combined armies, but they had also promised the Great Khan Genghis that they would destroy the Volga Bulgars enroute home, so they had to delay the oncoming Russians and Cumans by leaving some 1,000 men as a rear-guard on the Dniepner, under the command of Hamabek. In due time these men did their delaying job but were all killed, down to the last man. At the River Kalka the main Mongol army allowed the speeding, spread-out enemies to catch up with them and using their usual guile and splitting tactics, the Asians soon demolished the entire foe. Besides the thousands who went in backward flight, there were 40,000 Russians dead, including 6 princes and 70 nobles, all defeated by less than 18,000 Mongols and 5,000 Brodniki. This was in A.D. 1223. A little later, joined by another son of Genghis named Jochi and 10,000 reinforcements, they did strike the upper Volga and defeated the Kama Bulgars before moving on east into Asia. (Ref. 27 )

Fifteen years after that initial reconnaissance, the Mongols returned but there were two main obstacles to be overcome before entering European Russia. The first was still Bulgar, at the junction of the Kama and Volga rivers, which had grown rich with the fur trade. Slavs and Finns had been imported to work for the Bulgars, but the Mongols were not particular and killed all of Bulgar's 50,000 inhabitants. The city has never been rebuilt and the Bulgar state became a Mongol vassal. The second obstacle was a rejuvenated Cuman Kipchak group in the forests at the lower Volga, all of whom were slaughtered by the generals Manku and Budjek. (Ref. 27 ) Thus, as the Asians came into Russia they systematically eliminated in sequence the Volga Bulgars (1237), the great Principality of Vladimer (1238), the Cumans and Alans (1239) and finally the south Russian principalities. The army then split into two prongs to enter central Europe. (Ref. 137 )

To go back for a moment, plans had begun for this attack in 1236, with several corps of Chinese and Persian engineers, 20,000 conscripts and 50,000 experienced soldiers of the Mongol army which included no less than ten princes. At the beginning of the winter of 1237 generals Batu and Subedei had an army of 120,000 men ready to cross the frozen Volga and enter Russia, proper. As they drove into the center of that country there developed a reign of true terror. There was mass murder and destruction, then multitudes of prisoners and booty, with the targets including Moscow, Vladimir, Dimitrov, Tver, Rostov and Yaroslav among others. With the spring thaw, Batu stopped 60 miles short of Novgorod and turned back south to join Subedei. Although thus spared at the moment, Novgorod had to beat off repeated attacks of Germans and Swedes. The hero of these latter victories was Alexander Nevsky, Prince of Novgorod, who defeated the Teutonic Knights and saved the identity of north Russia. The story is that Nevsky lured the invading Germans onto the frozen surface of Lake Peipus, which broke beneath the weight of their horses and armor. (Ref. 27 ) To continue to elude Mongol devastation, however, Nevsky soon had to begin to pay continued tribute to the Asians and recognize their overlordship. (Ref. 8 , 137 )

Questions & Answers

what is microbiology
Agebe Reply
What is a cell
Odelana Reply
what is cell
Mohammed
how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
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Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
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_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
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How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
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what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
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Source:  OpenStax, A comprehensive outline of world history (organized by region). OpenStax CNX. Nov 23, 2009 Download for free at http://cnx.org/content/col10597/1.2
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