Guam fell to Japanese forces within days of Pearl Harbor and stayed under occupation for over two and a half years before American troops returned to retake it in July 1944. This episode of the Pacific: The Lost Evidence series sends investigators back to the island's beaches, ridgelines, and jungle interior with LIDAR scanning, forensic analysis, and archival photographs to reconstruct how the invasion and the fighting that followed actually unfolded on the ground. Historians walk the terrain where Marines and Army units pushed inland against entrenched Japanese defenses, while reenactments and period footage fill in what the surviving physical evidence cannot show directly. The investigation pays particular attention to the civilian population under occupation, tracing what Chamorro islanders endured before liberation. The result reads less like a battle summary than a piece of forensic reconstruction, testing textbook accounts of the campaign against what the landscape itself still holds.