a. He has fought all of us.
b. He has fought every one of us.
c. He has fought each of us.
d. He had a fight with all of us.
e. He had a fight with every one of us.
f. He has a fight with each of us.
In which case:
1. We are talking about separate fights
and in which case
2. We are talking about a fight with him on one side and all of us on the other.
This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
End of topic.