by John Marshall, Royal Naval Biography — Mainwaring… (1823)
“ Captain Mainwaring’s first appointment was, to the Tartarus sloop, fitted as a fire-ship; and in Aug. 1807, he appears to have been charged with the landing of the troops under Sir Arthur Wellesley (now Duke of Wellington) in Wibeck bay, preparatory to the investment of the Danish capital. Early in 1808, Captain Mainwaring was appointed pro tempore, to the Vanguard 74, which ship was the first of her class that ever wintered in the Baltic. He retained the command of her until June following, and then rejoined the Tartarus. ”
