Then. These chapters (20, 21), hy Figure of speech Hysterologia, describe events which took place soon after Joshua's death. See notes on Jdg_18:1 with Jdg_19:1.
children = sons.
as one man. All this excitement, unanimity, and bloodshed about an injury done to a woman; no sense of the evil of idolatry and sin against God, recorded in Jdg 19.