Sentence:  Whatever we felt about the redcoats , we respected them in terms of their trade , which was killing ; and I <WSD>know</WSD> that I , myself , was nauseated with apprehension and fear and that my hands were soaking wet where they held my gun . 
Meaning of the word marked with <WSD> tags:  be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt