APPENDIX A. PART I Notes on the YEMEN and the ADEN protectorate from the point of view of the Conduct of Military Operations therein, with particular reference to an Advance by land forces from the Western or Southern Coasts on ADEN. Ref. Map International Map of the World 1/1,000,000 and Sketch Map 1/2,000,000. Strategic Importance of the YEMEN. 1. The geographical position of the YEMEN in its relation to the Southern exit of the RED SEA and the fact that its Eastern border marches with that of the ADEN protectorate makes the State of strategic importance both to the Allies and Italy.