Two masked men dressed in fitness clothing worn by Army Rangers made their way onto a military base some 50 miles south of Seattle on Sunday night. The authorities said the men were intent on stealing thousands of dollars in combat equipment from an Army Ranger regiment there.

However, the robbery quickly went awry.

A soldier walked in and began asking questions as the two men were surrounded by piles of equipment. The soldier was bludgeoned with a hammer and one of the attackers brandished a knife.

As the robbers fled, they dropped a bloody rucksack full of stolen combat gear. Handwritten on the rucksack was the name “Fields,” which investigators discovered matched the last name of a man whose identification had been scanned when he drove that day onto the military installation, Joint Base Lewis-McChord.

His name led the authorities to a home elsewhere in Washington State, where they said they discovered a startling scene: rooms and rooms of Nazi and white supremacy paraphernalia and a stockpile of stolen weapons.

That, according to a criminal complaint filed on Wednesday in U.S. District Court in the Western District of Washington, tells the story of the investigation that led to the two men, identified by the authorities as Charles Ethan Fields and Levi Austin Frakes, being charged with assault, robbery and theft of government property “by force and by violence and by intimidation.”

The 11-page complaint and a Facebook post by the sheriff of Thurston County, Wash., so far amounts to the only public information about the activities of the two men, who were both identified in the complaint as veterans, leaving more questions than the authorities will currently answer.