No, actually, this is "These horses were smaller than the average horse today, their height about 1.45m at the withers, corespond to the height of a large pony, indeed they were large enough to pull a chariot." Quite a lot. The common Nogai bakhmat, the basis of the Russian estate cavalry and Peter's dragoons near Poltava - 136-146 cm. And such horses – almost all the ancient cavalry and 4/5 of the medieval. At the same time, one of the images with a spear in combat readiness. In general, fighting on a horse and ramming are very different things. Heavy armor is absolutely optional. Incidentally, in one image there is something that looks like a quilted jacket. It is quite normal for the eastern cavalry and with chain sleeves for the light English, for example. Among the Numidians, Classical Greeks, etc. not even that. Judging by the proportion of images in the total rather small volume, it does not seem that the Mycenaeans had less cavalry than the Assyrians. It is believed that the saddle was not even at getayr.