Madelin's "Fouché," vol. ii., p. 80; Pasquier, vol. i., pp. 353-360.
Seeley, "Life and Times of Stein," vol. ii., p. 316; Hausser, vol. iii., p. 219 (4th edition).
Our F.O. Records show that we wanted to help Austria; but a long delay was caused by George III.'s insisting that she should make peace with us first. Canning meanwhile sent £250,000 in silver bars to Trieste. But in his note of April 20th he assured the Court of Vienna that our treasury had been "nearly exhausted" by the drain of the Peninsular War. (Austria, No. 90.)
For the campaign see the memoirs of Macdonald, Marbot, Lejeune, Pelet and Marmont. The last (vol. iii., p. 216) says that, had the Austrians pressed home their final attacks at Aspern, a disaster was inevitable; or had Charles later on cut the French communications near Vienna, the same result must have followed. But the investigations of military historians leave no doubt that the Austrian troops were too exhausted by their heroic exertions, and their supplies of ammunition too much depleted, to warrant any risky moves for several days; and by that time reinforcements had reached Napoleon. See too Angelis' "Der Erz-Herzog Karl."