When the curtain first rises upon archaic times, we find those far-off Pharaohs struggling with the Libyans who had penetrated into the Delta from Tripoli and elsewhere. In early dynastic history they are the chief enemies of the Egyptians, and great armies have to be levied to drive them back through Siwa to their homes. Again in Dynasty XII., Amenemhat I. had to despatch his son to drive these people out of Egypt; and at the beginning of Dynasty XVIII., Amenhotep I. was obliged once more to give them battle. Seti I. of Dynasty XIX. made war upon them, and repulsed their invasion into Egypt. Rameses II. had to face an alliance of Libyans, Lycians, and others, in the western Delta. His son Merenptah waged a most desperate war with them in order to defend Egypt against their incursions, a war which has been described as the most perilous in Egyptian history; and it was only after a battle in which nine thousand of the enemy were slain that the war came to an end. Rameses III., however, was again confronted with these persistent invaders, and only succeeded in checking them temporarily. Presently the tables were turned, and Dynasty XXII., which reigned so gloriously in Egypt, was Libyan in origin. No attempt was made thenceforth for many years to check the peaceful entrance of Libyans into Egypt, and soon that nation held a large part of the Delta. Occasional mention is made of troubles upon the north-west frontier, but little more is heard of any serious invasions. In Arabic times disturbances are not infrequent, and certain sovereigns, as for example, El Mansur Kalaun, were obliged to invade the enemy's country, thus extending Egypt's power as far as Tunis. There is one lesson which may be learnt from the above facts--namely, that this frontier is somewhat exposed, and that incursions from North Africa by way of Siwa are historic possibilities. If the Senussi invasion of Egypt is ever attempted it will not, at any rate, be without precedent. When England entered Egypt in 1882 she found a nation without external interests, a country too impoverished and weak to think of aught else but its own sad condition. The reviving of this much-bled, anaemic people, and the reorganisation of the Government, occupied the whole attention of the Anglo-Egyptian officials, and placed Egypt before their eyes in only this one aspect. Egypt appeared to be but the Nile Valley and the Delta; and, in truth, that was, and still is, quite as much as the hard-worked officials could well administer. The one task of the regeneration of Egypt was all absorbing, and the country came to be regarded as a little land wherein a concise, clearly-defined, and compact problem could be worked out. [Illustration: PL. V. The mummy of Sety I. of Dynasty XIX. --CAIRO MUSEUM.] [_Photo by E. Brugsch Pasha._