Analysis of information sources in references of the Wikipedia article "Third Mithridatic War" in English language version.
Foiled in this, Lucullus now decided on a midsummer (68 B.C.) offensive deep into Armenia, to crush his «exhausted antagonists»Mithridates and Tigranes who, anticipating such a move, had assembled another large army with a powerful cavalry force to harass his foragers. He brought them to battle north of Lake Van, somewhere on the upper Arsanias, an eastern tributary of the Euphrates, and put their army to flight (PLUT., Luc., 31, 5). Tigranes at once retreated to his capital, Artaxata.