Summary of the book of judges chapter 11?

Gilead had a son but not from one of his wife's, from a maid. So he (Japheth) was cast out of the family. Many years later the Ammonites were going to attack Israel because they wanted their homeland back. So he sent a message to their king. He told them he story of how the kings of Edom, Moab, Sihon. Then God gave Sihon into Isreals hands and they defeated them. For 300 years Israel occupied Heshbon. The kind of Ammon paid no attention to what the servant had said. He starred to come. Japheth said God let me beat the Ammonites and the next thing that walks through my tent i will sacrifice. God lets the Isrealites win and his daughter (only daughter) was sacrificed. But she went with her friends for two months and cried in the hills.