Though clothed and armed with the Spirit of the Lord, yet, as the Lord is graciously pleased to work with human instruments, Gideon calls in the Lord's people to his aid. And are we not taught to do the same by prayer? See Paul's manner on this subject, Hebrews 13:18, etc.
Related Commentaries of Judges 6:35
Judges 6:35
35 And he sent messengers throughout all Manasseh; who also was gatheredk after him: and he sent messengers unto Asher, and unto Zebulun, and unto Naphtali; and they came up to meet them.