The term "shrapnel" comes from the name of an English officer, Major (later General) Henry Shrapnel.
The term "flak" is German in origin.
The term "blitzkrieg" was not used by the Germans. What they employed we'd call "combined arms warfare" today.
The French had more and heavier tanks than did the Germans in 1940, plus the Maginot Line, and the BEF.
Napoleon and Hitler both invaded Russia on June 22.
Many of our military terms are directly from the French language, enfilade and fort and ambush, for example.
The Britons who inhabited "England" after the fall of the Roman Empire were pushed west by the Saxons and Jutes and Angles who created "Engaland" over time. Many of the Britons moved to a peninsula on the French coast we now call Brittany, inhabited by Bretons. The Saxons were then pushed around by the Danes over time into one remaining kingdom, Wessex, which was saved by Alfred the Great, the only English kind called "the Great". Over time, Wessex consolidated England into a country until 1066 when it was invaded by a "Frenchman" from Normandy., Guillaume le Conquerant". We call him Bill. He became King of England and a vassal to the King of France at the same time, which led to all sorts of ructions over the next 800 years.
The terms Tsar or Czar and Kaiser come from the name Caesar.