During the
Second World War, Montgomerie served with the Royal Navy as an officer on various
Motor Torpedo Boats (MTB) as part of the
Coastal Forces of the Royal Navy. In December 1944, Montgomerie commanding 59 Flotilla, arrived in Malta from the United Kingdom (UK). The 59th Flotilla had been on operations around UK waters for over a year, including the
Normandy landings and its sailors considered to be 'seasoned campaigners'. He was awarded the
Distinguished Service Cross (DSC). The citation reads: Montgomerie retired from the Royal Navy with the rank of lieutenant commander but his subsequent post-war work on behalf of naval interests led to the title of Honorary Commander, Royal Naval Reserve. He was credited with the foundation of the Royal Naval Volunteer Reserve, R.N.V.R Club (Scotland) in 1947, which was subsequently based on the
Carrick in Glasgow. Montgomerie was instrumental in the restoration of the
Cutty Sark in London. ==Later life==