The Second World War brought many changes to the area. By this stage of the war, British troops had become a common sight on the streets of Seskinore. 1941 brought the arrival of evacuees from the city in the wake of the Belfast Blitz. Local Air Raid Precautions Officers Mr. Lynch and Mr. Walker oversaw the operation to find the evacuees safe homes in Seskinore.

The headquarters of 552nd Quarter Master Company was at Seskinore House, the home of the McClintocks. The 552nd arrived in Seskinore in October 1943. Most of them were from New York and New Jersey. The Quarter Master railheads at Beragh and Seskinore were the supply depots for Seskinore.

Knocknamoe Castle, in Omagh, was a centre for intelligence gathering and many US Army personnel and Free French, Polish and others were stationed there during the war.

General Eisenhower and Field Marshal Montgomery are said to have met at Knocknamoe on at least three occasions while planning the Normandy landings.

There are still remains of the base in the forest  you can see munitions huts a cold storage unit.

Local historian Matthew Dalton has created a series of clever before and after photographs of local Seskinore scenes. This provides great context the remaining buildings on the estate looking back to its use as a World War II American Service base as it became an important distribution post with the arrival of Quartermaster Units of the US Army in November 1943

Remarkably, the 552nd landed at Utah beach on D Day + 4 (20th June 1944) with no casualties.