Freeze!

THIS frieze in Euston's Triton Square caught my eye and made me stop to try to work out what it is showing.

I decided it might be an allegory. The figure sat on what appears to be a wooden wheelchair looks Roman, while the figures on the right seem to be dressed in the uniform of 19th-century Royal Navy officers.
Could it be a fanciful, patriotic depiction of how the 'burden' of Pax Romana was taken up by Pax Britannica?
The answer seems to be no. Rather it is a work by Edward Hodges Baily, originally intended for Marble Arch, showing the surrender of Francisco Javier Winthuysen y Pineda, a Spanish naval squadron commander, at the Battle of Cape St Vincent on St Valentine's Day 1797.
A British fleet under Admiral John Jervis defeated a much larger Spanish fleet under Admiral Don José de Córdoba y Ramos, according to Wikipedia.
The battle was famous for an incident when Horatio Nelson's ship, Captain, ran alongside the Spanish ship San Nicolás, which had become entangled with another Spanish ship, San José.
Nelson ordered his men to board and capture the San Nicolás and to cross it so as to also board and capture the San José, a manoeuvre that became jokingly known as "Nelson's patent bridge for boarding enemy vessels."
The frieze therefore apparently shows the commander of the San José, Winthuysen y Pineda, surrendering his sword to Nelson, the wheelchair perhaps indicating his mortal injuries. If so, the frieze shows Winthuysen y Pineda as having too many limbs - he lost an arm fighting the British when Spain joined the rebel side in the American Revolution.