Was this a success or failure? Most accounts of the Battle of Britain only mention aircraft losses but that ignores the whole point of German attacks on English Channel shipping. - How much shipping tonnage was sunk? - How much shipping tonnage was damaged? - How much cargo tonnage was sunk? - Perhaps most important of all, how much was port throughput reduced for London and the other English Channel seaports? London was the largest British seaport so closing it or severely curtailing cargo throughput would be a serious dent in the British economy.