Which warship was to be used as retaliation against union forces?

The Merrimack, also known as the Virginia.

Explanation:

The Merrimack, born as a Union frigate, became a Confederate battleship during the US Civil War and ushered in a new era in naval warfare. This was the warship that was to be used as retaliation against trade union forces.

In April 1854, the United States Congress authorized the construction of six similar warships, all named after rivers. Merrimack stuck to the base project, while Wabash and Minnesota grew a little longer, and Roanoke and Colorado a bit wider; The group's sixth unit was Niagara.

Launched in 1855 and armed in Boston in December of the same year, the Merrimack was built of oak, had the lines of a sailboat, and was easily maneuvered even when it was only boosted by sails. In fact, he was a sailing frigate with an auxiliary steam engine, as his two-cylinder propulsion equipment could not be considered effective as a basic power source.

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