General Sir John "Black Jack" Slade, 1st Baronet, (31 December 1762 – 13 August 1859) served as a general officer in the British Army during the Peninsular War.
He lacked talent as a combat leader.
Though Slade was praised in official reports, Arthur Wellesley, 1st Duke of Wellington criticized his actions privately and finally replaced him with a more efficient officer.
Despite this, he attained high rank after the war.