Taking a note from the current owner of the corona's own pages...

Who is the setup-ee? Caesar
Who is the setup-er? Pompey
And where and when does it happen. Dyrrhachium 49 BC

"Pharsalus (August 9, 48 by the Roman calendar but June 6 by the Julian calendar), Civil War between Pompey and Caesar had divided the Roman world with battles in Italy, Spain, Africa, Gaul, and now Greece. Only weeks before, Caesar’s armies had suffered a serious defeat following a long, but unsuccessful, siege of Pompey’s legions in the town of Dyrrhachium on the northern Greek coast. In breaking through the siege, Pompey might well have destroyed Caesar’s veterans if he had relentlessly pursued the routed army;"


"An act of treachery enlivened the siege. Both Appian and Cassius Dio imply that Caesar was contacted by a man in Dyrrhachium who offered to betray the town to him. Caesar went, late at night with only a small guard, to the gates of the Temple of Artemis to meet with the man when he was suddenly attacked by large forces which had been secretly conveyed along the shore in boats and waited to kill him at the rendezvous, attacking both his front and rear. Caesar barely escaped and lost many men; not surprisingly, he makes no reference to the plot. Simultaneously, Pompey, who must have been behind the bogus offer, attacked Caesar's contravallation in three waves, hoping to break through in his absence"