Loyalist.
Let's take a look at a few points in General Thomas Gage's history and decide what he is.
In April 1775, General Gage received orders to take action against the Patriots.
In June 1775, Gage issued a proclamation granting a general pardon to all who would demonstrate loyalty to the crown.
I don't think I need to look further. General Thomas Gage was definitely a Loyalist during the American Revolutionary War.
