I have a convoy from Kiel to reykjavik(Iceland). I have pumped the number of transports in the convoy to over 100. The convoy was established in December with oil and supplies selected to transport. In March my units are being killed by lack of supply. I have over 48000 supplies nationally. When I check the convoy it shows 0/0 for supply availability. The other thing to know is that the USA nuked Berlin. Is my convoy failing because my capital is dead? Is there something I can do to fix this?