In the earlier years of Shubbiluliuma the city was doubtless very much smaller than it subsequently became. But he used it effectively as a base, and, as much by diplomatic means as by actual conquest, he succeeded in making the power of the Hittites felt beyond their own borders. The Syrian revolts in the reign of Amen-hetep III., by which the authority of Egypt was weakened in her Asiatic provinces, undoubtedly received Hittite encouragement. Shubbiluliuma also crossed the Euphrates and ravaged the northern territory of Mitanni, the principal rival of the Hittites up to that time. Later he invaded Syria in force and returned to his mountain fastness of Khatti, laden with spoil and leading two Mitannian princes as captives in his train. On the accession of Akhenaten, Shubbiluliuma wrote him a letter of congratulation; but, when the Syrian prince Aziru acknowledged the suzerainty of Egypt, Shubbiluliuma defeated him and laid the whole of Northern Syria under tribute, subsequently confirming his possession of the country by treaty with Egypt. The state of Mitanni, too, submitted to Shubbiluliuma's dictation, for, on the murder of its powerful king Dushratta, he espoused the cause of Mattiuaza, whom he restored to his father's throne after marrying him to his daughter. We have recovered the text of his treaty with Mitanni, and it reflects the despotic power of the Hittite king at this time. Referring to himself in the third person he says, "The great king, for the sake of his daughter, gave the country of Mitanni a new life."[36] [Illustration: FIG. 54. LONGITUDINAL SECTION OF THE LOWER WESTERN GATEWAY AT KHATTI. The diagram, based on the conjectural restoration, indicates the massive construction of the gate-house, and the manner in which both it and the wall were adapted to the rising ground. The passage-way along the battlements must have passed through the towers. (After Puchstein.)] It was not until the reign of Mursil, a younger son of Shubbiluliuma, that the Hittite empire came into armed conflict with Egypt. A change of dynasty in the latter country, and the restoration of her old religion, had strengthened the government, and now led to renewed attempts on her part at recovering her lost territory. On the first occasion the Hittites were defeated by Seti I. in the north of Syria, and Egypt reoccupied Phoenicia and Canaan. Later on, probably in the reign of Mutallu, Mursil's son, Rameses II. attempted to recover Northern Syria. At the battle of Kadesh, on the Orontes, he succeeded in defeating the Hittite army, though both sides lost heavily and at an early stage of the fight Rameses himself was in imminent danger of capture. Episodes in the battle may still be seen pictured in relief on the temple-walls at Luxor, Karnak and Abydos.[37] [Illustration: FIG. 55. TRANSVERSE SECTION OF THE LOWER WESTERN GATEWAY AT KHATTI. The exterior projection of each flanking tower beyond the wall is indicated in the diagram. (After Puchstein.)]