Cross-border patent litigation in Europe has been controversial over the last 20 years. Relatively recent case law from the European Court of Justice (ECJ) has made cross-border patent injunction claims nearly impossible but certain other cross-border claims are still possible. This chapter examines what a European cross-border patent dispute is, legal arguments against cross-border patent claims, why cross-border patent injunction claims are now nearly impossible, what cross-border claims remain possible and whether "torpedoes" are still possible.