To be forewarned is to be forearmed.
There is frequent cross-referencing to later chapters in the book for detailed explanations of some topics which can be avoided by being forearmed with some prior knowledge.
That is how we were treated, and, therefore, the men are forewarned and forearmed, and they are not now going to be hoodwinked.
Because of the treatment we have received we are forewarned and therefore forearmed.
In that way, forewarned, we would to some extent be forearmed.
The tragedy is that normally forewarned is forearmed.
Those guilty of such acts would be forewarned and, therefore, forearmed.
To be forwarned should be to be forearmed.