Adam Clarke on Daniel 11:29

At the time appointed he shall return - Finding that his treachery was detected, and that the two brothers had united their counsel and strength for their mutual support, he threw off the mask; and having collected a great army early in the spring, he passed through Coelesyria; entered Egypt; and the inhabitants of Memphis having submitted to him, he came by easy marches to Alexandria. But, says the prophet, "it shall not be as the former or as the latter:" he had not the same success as the former, when he overthrew the Egyptian army at Pelusium; nor as the latter, when he took Memphis, and subdued all Egypt, except Alexandria. See the reason.