For years I've been saying that it couldn't be beyond the wit of man to have found a way to get a Vickers and half a ton of ammo up a twenty foot pole and within 100 feet of the front of the trench complex - maybe have it on a mobile bogey and raise it at the last minute. Have the troops crouch at first and crawl the last bit. Suppressive fire onto the target the whole way. It seems so obvious I can only assume they tried it and couldn't make it work, or, "Mad, mad, mad Blackadder. It simply won't do. Won't do at all"?