The obits are focusing on "The Sound of Music", but I'll always remember him for "Battle of Britain" and "Waterloo". Apparently, he also played Rommel in "Night of the Generals", although it has been a long time since I've seen that movie and I was only reminded of this by a google search. Never knew until I started reading the obits that he was Canadian.
Plummer and Steiger's performances in Waterloo, made the film a very good watch indeed. Here is the latest reaction from some of his peers: Christopher Plummer: Hollywood pays tribute to 'one of the greats'
Apparently Christopher P was not keen on his character in The Sound of Music as it was too 2-dimensional. He called the film The Sound of Mucus!
Triple Cross (1966 film) - Wikipedia Triple Cross was based loosely on the real-life story of Eddie Chapman, believed by the Nazis to be their top spy in Great Britain, although he was actually an MI5 double agent known as "Zigzag". TD