heathen. nations: i.e. the Canaanites.
them: thy People Israel.
people. peoples: i.e. the Canaanites.
cast them out. spread them about (as. vine, Isaiah 5); "them" referring to Israel in both clauses.
Related Commentaries of Psalms 44:2
Psalms 44:2
2 How thou didst drive out the heathen with thy hand, and plantedst them; how thou didst afflict the people, and cast them out.