21 Also her hired men are in the midst of her like fatted  bullocks; for they also are turned back, and are fled away together: they did not stand, because the day of their calamity was come upon them, and the time of their visitation.
21 The mercenaries in her ranks are like fattened calves. They too will turn and flee together, they will not stand their ground, for the day of disaster is coming upon them, the time for them to be punished.
21 Even her hired soldiers in her midst are like fattened calves; yes, they have turned and fled together; they did not stand, for the day of their calamity has come upon them, the time of their punishment.
21 All her hired soldiers are stationed to defend her - like well-fed calves they are. But when their lives are on the line, they'll run off, cowards every one. When the going gets tough, they'll take the easy way out.
21 Also her mercenaries are in her midst like fat bulls, For they also are turned back, They have fled away together. They did not stand, For the day of their calamity had come upon them, The time of their punishment.
21 Egypt's mercenaries have become like fattened calves. They, too, will turn and run, for it is a day of great disaster for Egypt, a time of great punishment.
Matthew Henry's Commentary on Jeremiah 46:21
Commentary on Jeremiah 46:13-28
(Read Jeremiah 46:13-28)
Those who encroached on others, shall now be themselves encroached on. Egypt is now like a very fair heifer, not accustomed to the yoke of subjection; but destruction comes out of the north: the Chaldeans shall come. Comfort and peace are spoken to the Israel of God, designed to encourage them when the judgments of God were abroad among the nations. He will be with them, and only correct them in measure; and will not punish them with everlasting destruction from his presence.