At the beginning of the Shoftim era, the bnei Yisroel were doing averiot such as worshiping idols.
Stop doing averiot
So Hashem has sent a bad king to Eretz Yisroel to take control over the Jewish people for 20 years
The Jewish people knew that they were losing wars,so they begged Hashem if they can do teshuva for thier averiot.
WERE SORRY for our AVERiot!
the teshuva for the jews worked and they decided to be part in the mitzva and get Eretz Yisrael back from the Caananim. But Hashem also wanted a shofet to be "part" of the war and that the soldiers will be part of the tribe of Zevulon. So the Jews decided to get the soldiers from the Tribe of Zevolun and get two shoftim named Devora and Barak (both husband and wife ) but devora was a shofet that was helping out in the miskan but also was a holy lady that taught torah and had her "office" outside becuase she's not allowed to be in a private place with a man .
I was told by Hashem that he will help us win the war!
So Barak took Devora and the rest of his soldiers to har Tavor ("battlefield") to fight Yavin and Sisra but however, they also came to har Tavor with soldiers from other nations that wanted to help fight the jews. Sisra's army came to the battle area but when they began to fight they heard very loud noises and they fled the area. However, not Sisra he knew if he fled the area he would lose the war making the Bnei Yisrael their land again.
Sisra ran off from the battlefield to hide somewhere that the Bnei Yisrael can't find him. So near the field a very special Jewish lady lived near it , her name was Yael. She saw Sisra running near the tent and told him