A few days ago in my present career we came across a "convoy" consisting of 5 DD's and DE's in CO42. It was after midnight, clear, calm with no moon & for a second I was tempted to have a go at one of them (hadn't seen any merchants up to that point in the patrol). Decided that it really wasn't worth the risk so we took off in the other direction. The next morning we sank an unescorted large merchant in the same grid square. Sometimes it pays to be little "cowardly"...