These are the three greatest last stands ever taken in history and one of them involves Sikh Soldiers

One of the stories of greatest last stands is of Shaitan Singh, who saved Arunachal Pradesh from the Chinese. He killed 300 Chinese soldiers during this battle, which took place on November 18, 1962 on mountains of Chushul in Ladakh. The Charlie company of 120 jawans of 13 Kumaon led by Major Shaitan Singh was protecting Chushul airfield which was important for India to hold on to Ladakh.
The People’s Liberation Army of nearly 5,000 soldiers equipped with heavy artillery attacked Chushul and it had become impossible for the Indian artillery to lend support, leaving the soldiers to fight for themselves. Major Shaitan Singh fought till last man and only 6 of the 120 member company survived the war, 114 did not.

This was fought between an alliance of Greek city-states, led by King Leonidas of Sparta, and the Persian Empire of Xerxes I over the course of three days, during the second Persian invasion of Greece. It took place simultaneously with the naval battle at Artemisium, in August or September 480 BC, at the narrow coastal pass of Thermopylae, or the Hot Gates.
The Persian invasion was a delayed response to the defeat of the first Persian invasion of Greece, which had been ended by the Athenian victory at the Battle of Marathon in 490 BC. Xerxes had amassed a huge army and navy, and set out to conquer all of Greece. The Athenian general Themistocles had proposed that the allied Greeks block the advance of the Persian army at the pass of Thermopylae, and simultaneously block the Persian navy at the Straits of Artemisium.