by John Marshall, Royal Naval Biography — Walker… (1823)
“ After the convention of Cintra, Lieutenant Walker returned home from the river Tagus in command of a Russian sloop of war, belonging to the squadron surrendered by Vice-Admiral Siniavin. He was subsequently appointed to the Barfleur 98, bearing the flag of Rear-Admiral (now Sir Charles) Tyler, and Colossus 74, Captain Thomas Alexander, which latter ship was attached to the squadron under Sir Richard G. Keats, employed in the defence of Cadiz. ”
