In 1756 with the opening of the
Seven Years' War he was again on active service, and in the first battle (
Lobositz) he distinguished himself so much that he was at once promoted major-general. He received his third wound on this occasion and his fourth at the battle of
Prague in 1757. Later in 1757 Lacy bore a conspicuous part in the great victory of
Breslau, and at
Leuthen, where he received his fifth wound, he covered the retreat of the defeated army. Soon after this began his association with
Field-Marshal Daun, the new generalissimo of the empress's forces, and these two commanders, powerfully assisted later by the genius of
Laudon, made headway against
Frederick the Great for the remainder of the war. Lacy, a lieutenant field-marshal at thirty-two, was made chief of staff (quartermaster-general) to Daun in the newly created general staff. They were cautious to the point of timidity since
Leuthen and many other bitter defeats had taught the Austrians to respect Frederick; but, having resolved to wear out the enemy by Fabian methods, they were strong enough to persist to the end. Thus for some years the life of Lacy, as of Daun and Laudon, is the story of the war against Prussia. After
Hochkirch (October 15, 1758) Lacy received the Grand Cross of the
Order of Maria Theresa. In 1759 both Daun and Lacy fell into disfavour for failing to win victories, and Lacy owed his promotion to Feldzeugmeister only to the fact that Laudon had just received this rank for the brilliant conduct of his detachment at
Kunersdorf. He shadowed
Frederick the Great's Prussian army during the failed
Siege of Dresden in 1760. His responsibilities told heavily on Lacy in the ensuing campaigns, and his capacity for supreme command was doubted even by Daun, who refused to give him the command when he himself was wounded at the
Battle of Torgau. ==Later career==