The answer you are looking for is the British 2nd Army in the heroic liberation of Caen. The operation was known as Operation Market Garden. That isn't true at all, even if it was operation market garden was a tactical failure that took place in holland, not a heroic liberation in France That being said, Operation Overlord, the invasion of Normandy is to this day the largest airborne invasion ever, and was a huge success, with all the chaos that occurred operational casualties were well below expected numbers.
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The invasion of the Soviet Union in June 1941 by Nazi Germany. Russia sustained a death toll of approximately 27 millium people.
the Great Wall is the world largest fortification
Vermont; Battle of Bennington Marker
Including active, reserved and paramilitary troops Iran has over 12,000,000 personnelThe above is a very interesting number considering that China, with about 2 million active is regarded as the largest in world right now. As for Iran Wikipedia gives a significantly smaller 545 thousand (545,000) active duty in the Iranian militaryThe largest army mobilized in history was the Soviet Union's Red Army during World War II which at one point had over 30,000,000 personnel (or so i hear)
Russia
Apart from a couple of countries that have no army at all - at best a professional Guard of Honor in front of the ruler's palace (like Monaco) - the country with the smallest 'real' army is St. Kitts and Nevis in the Caribean that has an army 150 soldiers strong.