Komentarz do Diwrej ha-jamim I 12:25

The sons of Judah, bearing shield and spear, six thousand and eight hundred Do not wonder that the smallest number of all the [people from] the tribes that came to him were from Judah, because it was not necessary for anyone to come to him from Judah to crown him since the sons of Judah had already crowned him in Hebron. But the remaining tribes, who had been with Saul’s sons until now - had to come to Hebron to crown him.

armed men of the army - Heb. חֲלוּצֵי צָבָא, those taken out of the people, and a similar case is found in חֲלוּצֵי צָבָא, of the Portion מַטּוֹת. Some say that חֲלוּצִים means armed, like רְצֵה וְהַחֲלִיצֵנוּ: be pleased and strengthen us.