He was a confectioner's apprentice in Nördlingen when, in the year 1800, the marches of the French army began in the neighbourhood. In an inn he began to sketch sergeants and Grenadiers, and went proudly home with the pence that he earned in this way. "Adam, when there's war, I'll take you into the field with me," said an old major-general, who was the purchaser of his first works. That came to pass in 1809, when the Bavarians went with Napoleon against Austria. After a few weeks he was in the thick of raging battle. He saw Napoleon, the Crown-Prince Ludwig, and General Wrede, was present at the battles of Abensberg, Eckmühl, and Wagram, and came to Vienna with his portfolios full of sketches. There his portraits and pictures of the war found favour with the officers, and Eugène Beauharnais, Viceroy of Italy, took him to Upper Italy and afterwards to Russia. He was an eye-witness of the battles at Borodino and on the Moskwa, and saved himself from the conflagration of Moscow by his courage and determination. A true soldier, he mounted a horse when he was sixty-two years of age to be present on the Italian expedition of the Austrian army under Radetzky in 1848. His battle-pieces are therefore the result of personal experience. When campaigning he led the same life as the soldiers whom he portrayed, and as he proceeded in this portrayal with the objective quietness and fidelity of an historian, his artistic productions are invaluable as documents. Even where he could not draw as an eye-witness he invariably made studies afterwards, endeavouring to collect the most reliable material upon the spot, and preparing it with the utmost conscientiousness. The ground occupied by bodies of troops, the marshalling of them, and the conflict of masses, together with the smallest episodes, are represented with simplicity and reality. In the portrayal of the soldier's life in time of peace he was inexhaustible. Just as vividly could he render horses undergoing the strain of the march and in the tumult of battle as in the stall, the farm-horse of the transport waggon no less than the noble creature ridden for parade. That his colour was sharp and hard, and his pictures therefore devoid of harmony, is to be explained by the helplessness of the age in regard to colouring. Only his last pictures, such as "The Battle on the Moskwa," have a certain harmony of hue; and there is no doubt that this is to be set to the account of his son Franz.