Contradiction with Deuteronomy 2:9
God instructed the Israelites not to distress the Moabites or provoke them to war, yet Judges 11:19 shows an appeal for peace with the Amorites, suggesting a need for military action.
Deuteronomy 2:9: And the LORD said unto me, Distress not the Moabites, neither contend with them in battle: for I will not give thee of their land [for] a possession; because I have given Ar unto the children of Lot [for] a possession. [Distress...: or, Use no hostility against Moab]
Contradiction with Deuteronomy 2:19
God told Israel not to harass or contend with the Ammonites, conflicting with Judges 11:19 where Jephthah seeks peaceful passage through their land, which leads to conflict.
Deuteronomy 2:19: And [when] thou comest nigh over against the children of Ammon, distress them not, nor meddle with them: for I will not give thee of the land of the children of Ammon [any] possession; because I have given it unto the children of Lot [for] a possession.
Contradiction with Joshua 11:20
This verse suggests that God hardened the hearts of the Canaanites to fight Israel, contrasting with Judges 11:19 where Jephthah attempts to negotiate peacefully.
Joshua 11:20: For it was of the LORD to harden their hearts, that they should come against Israel in battle, that he might destroy them utterly, [and] that they might have no favour, but that he might destroy them, as the LORD commanded Moses.
Contradiction with Exodus 23:31
This verse describes God promising the land of the Amorites to the Israelites, conflicting with the peaceful negotiation attempt of Judges 11:19.
Exodus 23:31: And I will set thy bounds from the Red sea even unto the sea of the Philistines, and from the desert unto the river: for I will deliver the inhabitants of the land into your hand; and thou shalt drive them out before thee.