The lads who assaulted the "impenetrable" Fort were deployed in several DFS230 gliders. The raid is studied as being a master stroke for its planning and operation on par with the Israeli raid on Entebbe. 80 men versus about 750 Belgian defenders took about 15 minutes to neutralize the main armament of the fort. They held the fort until relieved the next day.
Gliders were specifically chosen as they could be brought on to the 'LZ' in virtual silence. Every soldier involved in the operation against the Fort was apparently sworn to secrecy on penalty of death. There is a story of a Major Reinberger who almost compromised the overall operation by being in an aircraft that was forced down by weather in a Belgium farm field while he was in possession of secret orders.....although the specifics of the glider assault on the Fort was not contained in any written orders.