The only Axis-entity that'd NOT surrendered, finally!

[zaptiè]

San Marino was ruled by a fascit party , but was neutral.

[Ex Fred]

San Marino was ruled by a fascit party , but was neutral.

From Time Magazine 1940

As if she were not having enough troubles, Great Britain learned last week that the Republic of San Marino, with its 950 soldiers and 39 dazzlingly uniformed officers, all "in splendid condition," had declared war against her.
To do so the oldest and smallest republic—called by Abraham Lincoln "one of the most honored States in history"—had to conclude its 25-year war with Germany. Having entered World War I along with Italy, its neighbor and protector, San Marino forgot to show up when peace treaties were signed at Sevres and Versailles. Everyone else forgot...

From Wiki

San Marino was involved on both sides in the Second World War. In September 1940, it declared war on Britain in support of Fascist Italy.[11] Britain did not reciprocate, and when Italy surrendered in 1943 San Marino briefly declared itself neutral before declaring war on Nazi Germany in September 1944

Australian (Tasmanian) Newspaper - The Examiner - 19th Sept 1940

Liliputian State Declares War on Britain SAN MARINO, Sept. 17.

A proclamation issued to-day ended the 25-year war waged on paper against Germany. In lieu thereof, war has been declared against Britain. Two captains and the Regent, addressing the cheering populace, declared that the army was in splendid fighting trim and consisted of 39 officers and 950 other ranks.

San Marino is a small republic in the hills near Rimini, Italy. The integrity of its 28 square miles of territory has always been recognised by Italy. The population is put down at 15,545. San Marino, founded in the fourth century, claims to be the oldest state in Europe. In has no public debt and is governed by a Great Council of 60 members.

I could go on but I think you get the jist.