While Alexander's cavalry were making such a dangerous and furious fight, the Macedonian phalanx crossed the river and the infantry forces on both sides engaged. The enemy, however, did not resist vigorously, nor for a long time, but fled in a rout, all except the Greek mercenaries. These made a stand at a certain eminence, and asked that Alexander should promise them quarter.
Edition :
Plutarch. Plutarch's Lives. with an English Translation by. Bernadotte Perrin. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1919. 7.
Remark :
victim: Memnon's army is listed twice because the two different parts react differently to the attack. victim: According to the entry in the New Pauly, Memnon was in command at the Granicus.
http://referenceworks.brillonline.com/entries/brill-s-new-pauly/granicus-e427330 long-term consequence: After Alexander did not give them quarter, the mercenaries fight to their death. This is mentioned in 16.7
