On this day in history (25 July 1940) the following order was given: Aggressively attack invaders; act on your own initiative; regard any surrender broadcast or announcement as enemy propaganda; resist to the end.
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These dire instructions came not from Stalin or the Japanese high command, but instead from General Henri Guisan and the Swiss government who understandably feared an imminent invasion from their belligerent Italian and German neighbors. This pronouncement was in addition to earlier instructions to fight to the last drop of blood and to the last cartridge.

On this day (13 July) in 1945, some communists did the only thing they are useful for – fight fascist assholes. Following their invasion of Yugoslavia, the Germans, Italians, Hungarians and Bulgarians (the aforementioned assholes) set up a predictably brutal occupation of the country.
 
This caused some unlikely fellows to join forces, at least for a time. First were the hardcore Yugoslavian nationalists known as the Chetniks, whose standard featured a skull-and-crossbones and whose membership was mainly composed of those royal to the monarchy. Their foil was the Communist Party of Yugoslavia, and the Commander-in-Chief of their military forces Josip Tito. Together they launched what became known as the Uprising in Montenegro against occupying Italian troops. 

On this day in 1944 U.S. Soldiers and Marines encountered the largest Banzai attack of the Second World War. Approximately 4,000 able-bodied Japanese Soldiers, followed by their walking wounded, surged out of their positions and towards the American forces that were steadfastly working their way across the island of Saipan. With fixed bayonets and flags waving they sought to annihilate the American invaders in close combat.

On July 1st 1898, the United States Army successfully seized the San Juan Heights in what has become popularly known as “The Battle of San Juan Hill”. The battle itself was a bit of a mess tactically, but when the American forces finally surged up the hill they swept over the Spanish Forces and seized the last strategic terrain outside of the city of Santiago.