Detective Comics Vol 1 #737

Harley Quinn, the Joker, and the Huntress face off in "No Man's Land" in the conclusion of "The Code!" While the Joker's political campaign threatens to send the so-called society of "No Man's Land" even further into a state of anarchy, the Huntress and Billy Petit's renegade ex-GCPD band join the fray. But they've never tangled with someone like Harley Quinn, who doesn't appreciate anyone standing between her and her Joker!    
 
Story continued from: Batman #570