Britain defeated the U.S. forces in a mock military confrontation ending on Nov. 3.

The U.S. Marine Corps was no match for the Royal Navy. Marines had no choice but to surrender just five days into a simulated battle.

English forces disabled counterattacks and raided both U.S. forces’s headquarters and equipment. They thwarted a last-minute marines incursion, and captured two-thirds of U.S. territory in the end.

“Throughout this deployment our focus has been on integrating game-changing capabilities from across the commando force to deliver disproportional effect in the face of a free-thinking peer adversary,” British Lt. Col. Andy Dow said in a statement.

Dow accused U.S. Marines of failing the ability test, and declared the Royal Navy was “more lethal” and “sophisticated.”

Marines rejected the allegations, claiming the simulated battle was only meant to “assist commanders in meeting training objectives.”

“This exercise does not provide an opportunity to ‘surrender,’ ‘keep score,’ or ‘reset,'” a representative said according to the Business Insider. “The objective of the exercise is to heighten unit performance and increase readiness.”

Marines admitted the exercises were challenging.

“Tough, realistic training with foreign partners allows us to sharpen our skills, validate our techniques, and learn new tactics,” a representative said on Twitter. “Iron sharpens iron.”

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