In 2011 the National Army Museum conducted a poll to decide who merited the title of 'Britain's Greatest General'. In the end two men shared the honour. One, predictably, was the Duke of Wellington. The other was Bill Slim. Had he been alive, Slim would have been surprised, for he was the most modest of men - a rare quality among generals. Of all the plaudits heaped on him during his life, the one he valued most was the epithet by which he was affectionately known to the troops: 'Uncle Bill'.