Marshalling is the art of correctly arranging armorial bearings. Two or more coats of arms are often combined in one shield to express inheritance, claims to property, or the occupation of an office. Marshalling can be done in a number of ways, but the principal mode is impalement, which replaced the earlier dimidiation which simply halves the shields of both and sticks them together. Impalement involves using one shield with the arms of two families or corporations on either half.
Keywordsheraldry, armorial bearings, marshaling, two coats of arms combined, impalement, dimidiation
The Century Dictionary and Cyclopedia (New York, NY: The Century Co., 1889)