Judges 20:2, 8, 11

The chiefs of all the people of all the tribes of Israel, presented themselves in the assembly of the people of God, four hundred thousand men on foot who drew the sword.

Then all the people stood [unified] as one man, saying, “None of us will go to his tent, and none of us will return to his home [until this is settled].

So all the men of Israel assembled against the city, united as one man.