On the right flank, using the thick dust to cover his movements, Antigonus and Demetrius rode with their heavy cavalry around the engaged skirmishers and elephants to unexpectedly hit Eumenes's horse on their flank. Taken by surprise a great part of Eumenes's heavy cavalry under Peucestas routed. Despite Eumenes's heroic efforts to drive off the Antigonids, he was seriously outnumbered and was driven back. Antigonus and Demetrius used their cavalry to form a screen between Eumenes and the rest of his army. The battle of the elephants and skirmishers was decided when Eumenes' lead elephant was killed and the rest became so unnerved they fled. Antigonus had clearly won the battle on the right flank.