What horrible mistake does Cassius make? What is the outcome of this mistake?
He listens to bad information from Pindarus about Titinius. Pindarus tells him that Titinius is being captured, but Titinius is actually being cheered by their own troops, not the enemy's. We don't know whether Pindarus gave bad information intentionally or not. Maybe he was just relating what he thought he was seeing.