Presently the Israelites and Judahites were oppressed, and their captors would not let them go, but their Redeemer (Heb. go"el), Yahweh Almighty, was strong (cf. Exodus 6:6; Exodus 7:4-5; Exodus 9:1-3; Exodus 9:13-17; Exodus 10:3; Exodus 15:13). He would plead their case vigorously by contending with their enemy. Formerly, Yahweh had brought charges against His people as a prosecutor ( Jeremiah 2:9), but in the future He would act as their defense attorney (cf. Jeremiah 51:36). The Lord would bring turmoil to the Babylonians so that the rest of the world could enjoy rest when Babylon fell. [source][source][source]
"The redeemer or advocate in normal life was a kinsman who took it upon himself to avenge the murder of a kinsman, to protect him, or to secure his freedom or the release of his property (cf. Leviticus 25:25; Leviticus 25:47-55; Numbers 35:21; etc. 4])." [1][source]