Isaiah 19:4

R.V. And I will give over (lit. "shut up") the Egyptians into the hand of a cruel ("hard") lord (in Hebr. plur. of majesty), &c. The words suggest a foreign ruler and are quite applicable to any Assyrian monarch likely to undertake the conquest of Egypt. Esarhaddon in 672 and again Asshurbanipal in 662 ravaged the country as far as Thebes; the Empire was broken up into twenty petty principalities, and all attempts at revolt were sternly suppressed until 645, when Psammetichus, one of the native princes, succeeded in shaking off the Assyrian yoke and uniting Egypt under his own sway.

the Lord, the Lord of hosts here, as always, in confirmation of a threat. See on Isaiah 1:24.