Justin Torrence, who played Robert Rogers, returned to do stunts later on in the production. Though he shaved his beard, he can be seen in the background of some shots during the battle around the flour fort.
Angus MacFayden was approached to play the role of Graham but was unavailable due to scheduling conflicts. He then offered to reprise his role as Robert Rogers, after playing the same historical character in TURN: Washington's Spies (2014), though this film takes place 15 years prior to the events of that series.
In reality, Henry Bouquet and Anne Willing didn't end up together, and their brief romance was prior to the Seven Years War. After the events of Bushy Run and Fort Pitt, Bouquet took an assignment in Florida and ended up dying of Yellow Fever. In an early draft of the script, Bouquet received word from Ourry while at Fort Carslile that Anne was betrothed to another man. Later in the same draft, Bouquet dies of Yellow Fever at his post in Florida, hallucinating that the nurse attending him is his lost love Anne Willing. Though this more accurately depicted Bouquet's true history, it was decided early on in production that this would leave the audience unsatisfied, thus the story was altered.
The flour fort set was comprised of spray painted chicken feed, cracked corn, cat litter and linen sacks of sawdust.
Charlie Hunnam, Anson Mount, Clive Standen and Jim Caviezel were considered for the role of Henry Bouquet.