First of all, the writing (narrative and dialogue) is very weak, seeming on the juvenile side at times. When an author just takes one or two history books and makes narrative fiction from the events, this usually leads to a boring presentation. Better to read the history books. But when doing this is coupled with weak writing, the effect is a disaster. The writer should have spent another year in re-writes. Conjecturing about the gray areas of history is what can make these historicals worthwhile, but that can be misused, as it was here. One example, does anyone really believe that Joseph Warren, now the general of the army outside Boston, would, or could leave his post and go back into Boston, risking capture, just for a few medical supplies and to have sex with Margaret? This thought was inspired when the author read that Benjamin Church did just that, at least that was his excuse to the Patriots. But he went into Boston being Gage's spy, not for medicine.
There is some good stuff that can be developed here. I just wish these authors would take some pride and make good books instead of settling on the mediocre or worse.