30 They went up against the Benjamites on the third day and took up positions against Gibeah as they had done before.

Read Judges 20:30 Using Other Translations

And the children of Israel went up against the children of Benjamin on the third day, and put themselves in array against Gibeah, as at other times.
And the people of Israel went up against the people of Benjamin on the third day and set themselves in array against Gibeah, as at other times.
They went out on the third day and took their positions at the same place as before.