I can certainly sympathize with the Canadian desire to retain some control of how their troops were used and to ensure that they were used together. The US Army had to deal with the same challenge in the First World War, when General Pershing had to fight hard to create an American force when the other Allies wanted American formations to strengthen their own armies. However, the crisis of spring and summer 1918 forced Pershing to compromise and a number of American divisions went into the line under British and French command to stem the German offensive. It was well that they did so in the end, not only to prevent Allied defeat but to give the US Army some much needed battle experience and tactical knowledge without which it could not have played such an effective role when it fought under its own commanders in the final offensive. The Canadian Army faced the same sort of dilemma in WWII. Should the force be held together to fight only as a body and under the most favorable circumstances, or should some formations be blooded under British command in order to gain vital experience? There is a lot to be said in favor of the latter course, which is the one which was finally taken. JUBILEE was a mess and a disgrace and you can quarrel with the decision to commit Canadian troops to THAT particular operation, but if Canadian troops and commanders were ever going to be effective then they were going to have to face the music and take the chance of the dance sometime. Given the development of operations in the West, I don't see where there was any real opportunity to put the 1st Canadian Army as a whole into action prior to OVERLORD. That being the case, only single divisions and eventually a Canadian corps could be employed. Incidentally, the US Army did not deploy a full army command until HUSKY; in TORCH and Tunisia, II US Corps operated under command of British 1st Army. Neither we nor the British were entirely happy with that arrangement and it left some sour feelings afterwards, but four US divisions got into action to gain experience and they contributed strongly to the Tunisian victory as well.