This painting depicts an event that occurred in the history of Spain.
Torrijos was a soldier and minister during the Liberal Triennium, a period of 3 years when the Constitution was reinstated in 1820, opposing the absolute power of King Fernando the Seventh.
Absolute power means the king has all the power without limits.
When the Liberal Triennium government fell, Torrijos had to leave Spain and go to England for political reasons.
He was later deceitfully convinced he could return to Spain and rebel against the king.
To rebel means to refuse to obey someone with authority.
Torrijos and his followers fell for the deception and boarded a ship to return to Spain.
The ship was captured, and they were all executed without a trial for treason against the king.