His army travelled north, stopping at Napata, Elephantine, Thebes and Heliopolis fortifying both in 664 BC. Tantamani arrived in Memphis in April 663 BC and killed Necho I during the ensuing fight near the city. Tantamani then proceeded north and received the capitulation of some but not all Delta kinglets,[8] then expulsed the remaining Assyrian troops from Egypt while Necho's young son Psamtik managed to flee to Assyria via Palestine.[9][10]