Browne's fortunate diversion of the enemy's attacks at Kolin, 18 June 1757, contributed materially to the allied victory, and in token of her appreciation of his conduct on the occasion Maria Theresa presented him with a snuff-box set with brilliants and adorned with her portrait. At Zorndorf, 25 August 1758, he again distinguished himself in a similar manner, his opportune assistance of the right wing at the most critical moment of the battle changing almost inevitable defeat into victory. By Peter III he was named general-in-chief, and appointed to the chief command in the Danish war.