ART. II.—If the Pacha of Egypt should refuse to accept the above-mentioned arrangement, which will be communicated to him by the Sultan, with the concurrence of their aforesaid Majesties; Their Majesties engage to take, at the request of the Sultan, measures concerted and settled between them, in order to carry that arrangement into effect. In the meanwhile, the Sultan having requested his said Allies to unite with him in order to assist him to cut off the communication by sea between Egypt and Syria, and to prevent the transport of troops, horses, arms, and warlike stores of all kinds, from the one province to the other; Their Majesties the Queen of the United Kingdom of Great Britain and Ireland, and the Emperor of Austria, King of Hungary and Bohemia, engage to give immediately to that effect, the necessary orders to their naval Commanders in the Mediterranean. Their said Majesties further engage, that the naval Commanders of their squadrons shall, according to the means at their command, afford, in the name of the Alliance, all the support and assistance in their power to those subjects of the Sultan who may manifest their fidelity and allegiance to their Sovereign. ART. III.—If Mehemet Ali, after having refused to submit to the conditions of the arrangement above-mentioned, should direct his land or sea forces against Constantinople, the High Contracting Parties, upon the express demand of the Sultan, addressed to their Representatives at Constantinople, agree, in such case, to comply with the request of that Sovereign, and to provide for the defence of his throne by means of a co-operation agreed upon by mutual consent, for the purpose of placing the two Straits of the Bosphorus and Dardanelles, as well as the Capital of the Ottoman Empire, in security against all aggression. It is further agreed, that the forces which, in virtue of such concert, may be sent as aforesaid, shall there remain so employed as long as their presence shall be required by the Sultan; and when His Highness shall deem their presence no longer necessary, the said forces shall simultaneously withdraw, and shall return to the Black Sea and to the Mediterranean, respectively.