This is straight from the Neutrality Declaration issued by Great Britain in 1861, and defines what is prohibited (annotations added to help reading comprehension, as the language is somewhat dense)
"equip, furnish (1) , fit out, or arm, or attempt or endeavor to equip, furnish, fit out, or arm, or procure to be equipped, furnished, fitted out, or armed, or shall knowingly aid, assist, or be concerned in the equipping, furnishing, fitting out, or arming of any ship or vessel(2) , with intent or in order that such ship or vessel shall be employed in the service of any(3) foreign prince, State or potentate, or of any foreign colony, province, or part of any province or people (4) , or of any person or persons exercising or assuming to exercise, any powers of government in or over any foreign State, colony, province, or part of any province or people(5), as a transport or store ship, or with intent to cruise or commit hostilities (6) against any prince, State or potentate, or against the subjects or citizens of any prince, State, or potentate, or against the persons exercising or assuming to exercise the powers of government in any colony, province, or part of any province or country, or against the inhabitants of any foreign colony province, or part of any province or country, with whom His Majesty shall not then be at war(7);
1. furnishing is all that is required. Note that arming is a separate action, but is not required to violate the Declaration. Merely furnishing a ship described below is a violation.
2. Any ship or vessel. This defines what would be "furnished". So it s furnishing any ship or vessel.
3. This is the intent section. So furnishing a ship or vessel with the intent that it would satisfy the following language is prohibited.
4. This section identifies countries that Great Britain recognizes, such as the USA.
5. This is the section that applies to the CSA, since Great Britain did not recognize it. It identifies persons or persons exercising or attempting to exercise powers of a government.
6. This section identifies what kind of ship. So it could be a transport ship, store ship, or a ship intended to cruise or commit hostilities. So note it did not have to be a raider or even armed!!! Transport ships are enough.
7. This refers back to sections 4 and 5, and is the substance of the Neutrality intent. You could not provide ships to any country or group of persons that Great Britain is not at war with, like the USA or the CSA.