en_tn_condensed/jdg/05/20.md

From heaven the stars fought, from their paths across the heavens they fought against Sisera

Yahweh helping the Israelite to defeat Sisera and his army is spoken of as if the stars themselves fought against Sisera and his army. This may refer to Yahweh using natural elements, specifically rain storms, to defeat Sisera. (See: rc://en/ta/man/translate/figs-personification)

against Sisera

Here "Sisera" represents himself and his whole army. AT: "Sisera and his army" (See: rc://en/ta/man/translate/figs-synecdoche)

Sisera

See how you translated this name in Judges 4:2.