Grey Beard,
Since it's later in the game, I find that I usually have a large number of veterans of all classes, especially in the east, so I try to concentrate as many of them as I can in the Tbilisi-Trezibond regions. I build forts at the mountain passes and rivers in areas where I can limit the Mongol number of reinforcements while maximizing mine. There are a few good locations of that sort in that area. If they are spaced close enough together, units from one fortress can reinforce the other within one-two turns. I try to have one mobile force that is an entire full stack of cavalry which I usually base just north of Tbilisi.
Using this tactic, I have watched the Mongols approach from the Sarkel region in two different games, only to see them turn around when they saw the defenses, and move towards Kiev instead. Because of that I also make it a point to make sure I possess at least one seaport in the Dacia area and a fleet at Trezibond so that I can transfer troops back and forth efficiently between both areas. In the games I've played, the Mongols have taken both routes, so having a fleet nearby somewhat eases the worry of where to distribute the heaviest lines of defense.
Maintaining a large force in the region can be relatively expensive, but one can develop the Byzantine Empire into an economic powerhouse quickly enough with the proper building investments and profit-minded territorial expansion. The merchants are very useful too, so money hasn't been the biggest issue in the games I've played.
It was handy advice you provided. Thanks and cheers.
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