Attack on Guam - December 8 1941

The First Battle of Guam was an engagement during the Pacific War in World War II, and took place on 8 December 1941 on Guam in the Mariana Islands between the Empire of Japan and the United States. The American garrison was defeated by Japanese forces, which resulted in an occupation until the Second Battle of Guam in 1944.
https://en.wikipedia.org/wiki/Battle_of_Guam_(1941)

The Guam defending force was woefully undergunned: 274 Navy personnel, more than half of them non-combative personnel; 153 Marines; and about 120 Insular Force Guards, whose military training was minimal at best.

The Guam defenders’ total arsenal were three machine guns, four Thompson submachine guns, six Browning automatic pistols, fifty .30 caliber pistols, a dozen .22 caliber regulation rifles, and 85 Springfield rifles. Most of the weapons were of World War I vintage. Imprinted on the Springfield rifles were labels with the following notation: “Do not shoot. For training only.”
https://suburbanbanshee.wordpress.com/2014/12/07/the-japanese-attack-on-guam/