What wars or missions have have Canadian troops helped?

WW2

Dieppe Raid

Ortona, Italy

Monte Cassino, Italy

Attack on Gothic Line, Italy

D-Day invasion of Normandy, France (one of the 5 beaches were dedicated to the Canadians)

Operation Market-Garden

WW1

Other Wars

There were not a lot of wars that Canada fought in by themselves. They were a part of Great Britian, so they fought with them in many wars prior to WW2, including WW1.