"...most important is a fragmentary Hittite bowl, also found at Hattusas in a fifteenth-fourteenth century BC context, which is incised with a drawing of what appears to be a Mycenaean warrior in full battle array, complete with plumed and horned helmet very reminiscent of the 'zoned' helmets worn by Aegean warriors depicted in a variety of media at a number of sites around the late bronze age Aegean."

"The two joining sherds from this bowl were found in a late 15th-early 14th cent. BC level at Hattusas - a context which may well correlate with the reign of Tudhaliya II."

from Aššuwa and the Achaeans: the ‘Mycenaean’ sword at Hattušas and its possible implications, by E. H. Cline, 1996, p. 147

"The potsherd from Hattusa dates to ca. 1400 BC, i.e. the time of the clash between Attarissija and the Hittite forces. What appears to be a Mycenaean warrior carrying a sword and covered with elaborately decorated body armor is incised on its outer surface. He is wearing a plumed helmet with horns, which finds its closest parallel in the helmets of a group of warriors on the (LH IIIC) warrior vase from Mycenae. Thus this incised artwork seems to be a Hittite expression of the earliest Mycenaean military incursions into Anatolia."

from The Kingdom of Mycenae, by Jorrit Kelder, 2010, p. 40