This convoy situation actually represents a potential contradiction (paradox) in the Diplomacy rulebook. England has a fleet in the Norwegian Sea, France has an army in Clyde, and Russia controls the North Sea and Norway. England wants to be able to retreat to Edinburgh, which is open, to cover his home center, so he doesn't want to bounce, yet knows he is losing the Norwegian Sea to the Russian attack. France orders their army from Clyde to move to Edinburgh to potentially bounce the English fleet; however, the English, seeing an opportunity, orders the convoy of the Clyde army to Edinburgh, knowing the convoy will fail due to the fleet being dislodged by the Russian attack. The French move to Edinburgh fails because no order takes precedence over another, and the English fleet happily retreats to Edinburgh.
Anybody ever encountered this situation (or similar) or have any opinions on how it should be adjudicated? DipArchive has an article on the scenario here (http://www.diplom.org/~diparch/resources/strategy/articles/rulebook.htm). Seems to be a contradiction in the rules, or is it just good strategy by the English?