[bduerst]

It's likely he meant the oxen had reflective wet-looking faces, like the surface of the ocean was wet-looking, as in the context it was used the oxen were sweating pretty hard:

> ...but as two wine-faced oxen both strain their utmost at the plow which they are drawing in a fallow field, and the sweat steams upwards from about the roots of their horns – nothing but the yoke divides them as they break up the ground till they reach the end of the field – even so did the two Ajaxes stand shoulder to shoulder by one another.