On 20 September 1854, Russell covered the battle above the Alma River—writing his missive the following day in an account book seized from a Russian corpse. The story, written in the form of a letter to Delane, was supportive of the British troops and paid particular attention to the battlefield surgeons' "humane barbarity" and the lack of ambulance care for wounded troops. He later covered the Siege of Sevastopol where he coined the phrase "thin red line" in referring to British troops (93rd Highlanders) at Balaclava, writing that "[The Russians] dash on towards that thin red streak topped with a line of steel...".