I measured the gradient where the two YC met as approximately 17 degrees. R'as YC seem to get 9 charge kills while Tomi inflicts 5 charge kills. As the YC continue to fight, R'as YC reaches 50 men at the point Tomi YC has 40 men left. So, R'as YC seems to be achiving a 2 to 1 combat advantage by virtue of the 17 degree slope. Tomi CA charging into the flank of R'as YC equalizes the fighting with both YC arriving at the 37 man mark together and the CA down to 45 men at the same time. At the point of contact by the charging Tomi CA, R'as YC morale is reduced to wavering, but the unit doesn't rout. R'as YC is getting a +2 morale bonus for being on higher ground. R'as YC may well have routed if this action had taken place on flat terrain.

The outnumbering of R'as YC by Tomi's 3 cav is deceptive because R'as has a unit in the trees which is probably close enough (within 75 meters) to provide morale support to his YC. In this case, the outnumbering by Tomi would be 3 to 2, but 2 to 1 is needed to inflict -4 morale on the R'as YC.

Fatigue wasn't a factor since none of the units involved dropped below quite fresh.