“The conflict aroused Muslim public opinion and each of the belligerents tried to shift the responsibility of the war to the other. The Imam sent private letters to a number of leaders in the Muslim world to defend himself. These letters were considered by the government of Saudi Arabia ‘absolutely contrary to actual facts and full of obvious lies.’ (Green Book, Introduction, p. ii.) Consequently the government of Saudi Arabia published the ‘Green Book,’ which is a record of the diplomatic correspondence between the governments of Yeman and Saudi Arabia. The ‘Green Book’ dates the origin of the dispute from 1926, when the Imam extended his protection to the Adrisis (of Tihama). This protection was recognized by Ibn Saud by the treaty of Oct. 21, 1926. But the new boundaries between the two monarchs were not settled. This led to many disagreements and conflicts. One of the points at issue was the dispute on the Jabal Aru (Aru mountain). The Aru dispute, however, was only one among many others which preceded the war. The arbitration is given as an example to show the peaceful attitude of Ibn Saud so that he went so far as to give an opinion against his own interest. The account is true, no doubt; but it is a true story to show not necessarily a wholly true attitude.”