It was also the duty of the Secretary-General to mediate in cause of conflicts within the alliance. He was successful in the conflict between Great Britain and Iceland, the so-called Second Cod War not by pressuring the Icelandic government to end its aggressive behaviour against British trawlers but by convincing the British government that it had to take the first step by calling back its destroyers to open the way to negotiations. Luns failed however in the conflict between Greece and Turkey over the territorial boundaries and Cyprus. Lack of co-operation on both sides made Luns unable to mediate or advise on procedures to find a way out.