Brewer's: Belfast Regiment
(The ). The 35th Foot, which was raised in Belfast in 1701. There is no such regiment now in the British Army. What used to be called No. 35 is now called the 1st battalion of the Royal Sussex, the 2nd battalion being the old No. 107.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894