André Geraque Kiffer 
Battle Of The Kalka River, May 31, 1223 [PDF ebook] 

Because of the similar strategic situation of isolation from the Crusaders forces in the rugged geography of the Levant, and because of the local tactical situation requiring caution in crossing an obstacle in the presence of a treacherous enemy, the Russian army in this simulation of the battle of the Kalka River will initially adopt a typical Crusader battle order, that is, a staggered defensive in the center and the flanks battered. The Russian phasing of the battle will begin by fighting against the Mongol rearguard; will evolve to safety by the Cumans in the formation of the Russian battle line; continuation will depend on the Mongol reaction, but remembering first not to be defeated, then trying to win, if only with the Mongol withdrawal.