Normally artillery was attached to a cavalry unit. A battery of 4 to 6 guns, would be attached to a cavalry brigade, a larger unit, but sometimes a regiment may have a section of two guns attached for the balance of the operation. Early in the war, artillery was sometimes an organic part of a infantry or cavalry regiment. This practise quickly came to an end because this arrangement limited the use of one or the other type of unit. It didn't work out.