  We consider the extension of classical history theory to the massive vector
field and electromagnetism. It is argued that the action of the two Poincare
groups introduced by Savvidou suggests that the history fields should have five
components. The extra degrees of freedom introduced to make the fields
five-dimensional result in an extra pair of second class constraints in the
case of the massive vector field, and in an extended gauge group in the case of
electromagnetism. The total gauge transformations depend on two arbitrary
parameters, and contain `internal' and `external' U(1) gauge transformations as
subgroups.
