In the reign of Sennacherib, Egypt's involvement with *Assyria was renewed, particularly with relation to their conflict over the vassal-states in Syria/Palestine who were now requesting Egyptian support against the expansionist policies of *Assyria.
In his third campaign Sennacherib set out to subdue the *Phoenician coastal towns. After another series of events, Hezekiah, King of Judah, appealed to Egypt for help; the combatants met at El-tekeh and there was a great defeat for the joint Egyptian and Ethiopian forces (Egypt was now ruled by a dynasty of Ethiopian kings) at the hands of the *Assyrians. This may have been the only time that the Egyptians came into direct conflict with Sennacherib, but a Biblical reference (II Kings, xix, 8-35) suggests that their forces were due to meet on another occasion but that many of the *Assyrian soldiers were slain in the night through God's intervention and were forced to return to Nineveh.
Ultimately, Sennacherib was assassinated at Nineveh, but his contest with the Egyptians was pursued with even greater vigour by his successors, *Esarhaddon and *Ashurbanipal.
BIBL. Luckenbill, D.D. Annals of Sennacherib. Chicago: 1924; Kitchen, K.A. 3rd Int. pp. 154-6.
Biographical Dictionary of Ancient Egypt by Rosalie and Antony E. David
Ancient Egypt. A Reference Guide. EdwART. 2011.