Israel had 400,000 men of war;
Benjamin had 26,000 men of war + 700 special men from Gibeah, who could sling a stone at a hair’s breadth and not miss. They were expert stone throwers.

During their first battle, with the Divine’s permission, the sons of Israel were defeated by their brothers from the tribe of Benjamin. The Benjamites killed 22.000 Israelites.

Before returning to war against their brothers, the children of Israel went up and wept before the Lord until evening, and asked counsel of the Lord, saying, “Shall I again draw near for battle against the children of my brother Benjamin?” And the Lord said, “Go up against him.” Judges 20.23

But, it seems like the Israelite’s long hours of crying did not move the heart of the LORD.
And again, they were defeated and lost another 18,000 soldiers, a total of 40,000 soldiers, in other words, 10% of their army.

Then all the children of Israel, that is, all the people, went up and came to the house of God and wept. They sat there before the Lord and fasted that day until evening; and they offered burnt offerings and peace offerings before the Lord, Judges 20.26

And for the third time, still with the Divine’s permission, the sons of Israel went out to confront the sons of Benjamin.

On that day, the Lord gave victory to Israel and they razed the army of the sons of Benjamin. Only 600 men remained, because they fled.

In conclusion: as long as Israel relied on their large army (400,000 men against 26,700), not even many hours of weeping and humiliation before the Lord gave them the victory. But when:
1º – They wept before the Lord;
2º – Fasted that day until evening and
3º – Offered burnt offerings and peace offerings, they razed their enemies.

The question is: what does this FACT teach the children of God nowadays?
To cry and try to move the LORD with tears, or go for the all or nothing by weeping, fasts and sacrifices?
Each person should make their own choice according to their faith.

* Image is merely illustrative