The correct answer is - I shall be telling this with a sigh. Wistful reflection means that he is thinking about something from the past that makes him sad or nostalgic or regretful. When we sigh it can mean several things, one of them is an indication that we are reflecting on something that brings up different emotions.
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Operation Overlord was the codename for the Battle of Normandy, the Allied operation that launched the successful invasion of German-occupied Western Europe during World War II. The operation was launched on 6 June 1944 with the Normandy landings.