During the eventful six months of the Russian campaign, Macdonald, who commanded the left wing, had remained in Courland, with an army of about 30,000 men, of whom 22,000 were Prussians, the rest Germans of different countries. It would seem that Napoleon had been averse from the beginning to employ these unwilling auxiliaries upon any service where their defection might influence the other parts of his army. Yet they behaved well upon several occasions, when Macdonald had occasion to repel the attacks and sallies of the numerous garrison of Riga, and their active exertions enabled him to save the park of heavy artillery destined for the siege of that place, which had almost fallen into the hands of the Russian general Lewis, at Mittau, on the 29th of September. But on this occasion, though having every reason to be pleased with the soldiers, Macdonald saw room to suspect their leader, D'Yorck, of coldness to the French cause. That officer was, indeed, engaged in a service which at heart he detested. He was one of the Tugend-Bund, so often mentioned, an ardent Prussian patriot, and eager to free his native country from a foreign yoke. He therefore eagerly watched for a plausible opportunity when he might, without dishonour, disunite his forces from those of the French maréchal. About the beginning of December, the situation of Macdonald became precarious. Nothing was heard on every side, save of the rout and disasters of the French grand army, and the maréchal anxiously expected orders for a retreat while it was yet open to him. But such was the confusion at the headquarters after the Emperor's departure, that neither Murat nor Berthier thought of sending the necessary authority to Macdonald; and when they did, though the order to retreat might have reached him in five days, it was ten days on the road.