During World War II, the Mynydd y Garreg Home Guard played a vital role in supporting American troops billeted in Kidwelly as they prepared for Operation Overlord. Local volunteers trained in Smarts Quarry, guarded bridges, and shared their knowledge of the land with GIs at Broomhill House. Their collaboration helped sharpen the soldiers’ readiness for Normandy, while the community’s resilience and hospitality created lasting bonds. This overlooked chapter shows how a small Welsh village became a crucial staging ground for freedom, with the Home Guard’s dedication leaving an indelible mark on both local and global history.