Contradiction with Matthew 5:44
Judges 11:5 describes calling Jephthah to fight, while Matthew 5:44 teaches to love enemies, not to gather for battle.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Romans 12:19
Judges 11:5 involves seeking vengeance through Jephthah, whereas Romans 12:19 advises leaving wrath to God and not seeking personal vengeance.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Contradiction with Proverbs 24:29
Judges 11:5 focuses on seeking help for retribution, contradicting Proverbs 24:29, which instructs not to say "I will do to him as he has done to me."
Proverbs 24:29: Say not, I will do so to him as he hath done to me: I will render to the man according to his work.
Contradiction with 1 Thessalonians 5:15
Judges 11:5 pertains to the pursuit of conflict resolution via force, contrasting 1 Thessalonians 5:15 which urges not to repay evil for evil.
1 Thessalonians 5:15: See that none render evil for evil unto any [man]; but ever follow that which is good, both among yourselves, and to all [men].