Arnhem and "crossing the Rhine". My family watched the gliders and towing aircraft fly over from eastern Englandfor both operations and the sky was full of aircraft.
However, the US Army withdrew their paratroopers and reused them for Market-Garden. What if the Brits had use their gliders again at Arnhem and landed them close to the bridge and on the far side? It was a U.S. Army maxim that you needed to attack both ends of the bridge at once if you wanted to secure it.
Bob
"It is said, 'Go not to the elves for counsel for they will say both no and yes.' "
Frodo Baggins to Gildor Inglorion, The Fellowship of the Ring
We did land on the far side of the river, both paratroops and gliders. Unfortunately the areas chosen as suitable for drop zones and landing zones for gliders proved to be too far from the bridge due to intense opposition. The Poles landed on the near side but were delayed by fog in England.
When the order came to withdraw my own relative had to swim the river and he had swim part of the way underwater because he was being shot at.