estimate of bombing effects, assuming always that allocations for U-boats receive sufficiently high priority. The provision in Norway of diesel for U-boats is essential in the case of those U-boats which operate from Norwegian bases, totalling say, 45-50, and convenient in the case of all boats leaving the Baltic to operate; but for the latter class only small quantities are needed. We estimate the minimum requirement for the operation of U-boats from Norwegian bases at 5,000 tons per month. Army 5.