Thou hast broken Rahab in pieces - Margin, “Egypt.” See the notes at Psalms 87:4. The reference is to the exodus of the Hebrew people, when he destroyed the power of Egypt.
As one that is slain - Slain on the field of battle; as a man pierced through with a sword or spear.
Thou hast scattered thine enemies - At the time referred to, in Egypt; and at other times, when the enemies of God and of his people had been discomfited.
With thy strong arm - Margin, as in Hebrew, the arm of thy strength. That is, by his power - the arm being the symbol of power. See the notes at Psalms 77:15. Compare Deuteronomy 5:15; Deuteronomy 7:8, Deuteronomy 7:19, et al.