The series takes place in 1757.
The use of Caucasian actors in the Native American roles was necessary for this production because there were no living Native American actors in England at the time of filming.
Kenneth Ives, Philip Madoc, Bill Wiesener, Noel Coleman, Terence Brook, Hilary Minster, George Pravda, Michael Lynch and Roy Skelton were all cast by director David Maloney in Doctor Who (1963).