A batman is an army member assigned to an officer[?]. A batman is supposed to be able to act as a "runner" to convey orders from the officer
to subordinates. He also looks after the officer’s equipment etc.
... and the Second Helvetic Confession[?] as a definition of their teaching, together the Ecumenical creeds of the Christian Church: Athanasian Creed, Nicene Creed, Chalcedon, ...