The Band of Five - A group of legendary martial warriors. They consisted of a set of triplet fighters (each who used a different weapon), a laconic elven scout, and a redeemed rogue who had discovered religion and was an honorary member of a paladin order. This group of heroes fought to defend the kingdom from the evil horde of (whatevers), while the kingdom sought outside allies.
While no one came to the defence of the kingdom, these heroes led a very small company (less than a hundred men) against a force numbering in the thousands. They engaged in hit and run raids, suffering serious losses - the scout was killed by a sniper's arrow, and one of the triplets was killed while defending a small hamlet.
The remaining three heroes (and the survivors of their company) wound up holding a small fortress for three weeks against invading forces - long enough to allow for the evacuation of an entire valley, and to buy time for troops to come to the rescue of the kingdom. The heroes and all of their companions were killed in this last stand.
(if you want to make it less "The Alamo", you can always change the fortress to a pass, and change it all to "300").
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A brother and sister pair of heroes - the brother a noble paladin, the sister a brave cleric. They were involved in numerous battles against the undead, until an evil assassin being chased by an order of holy avengers used a magical item to bind his soul to that of the sister. To protect the life of his sister, the paladin had to protect the assassin long enough in order to find the cure.
The paladin committed many wrongs during this quest - slaying lawful avengers, evading the law, and indirectly assisting the assassin in his slayings. The avengers, meanwhile, found where the sleeping body of the cleric was being held and prevented the paladin from reaching the body. Eventually, the cleric was able to break free of the spell holding her hostage, and killed herself - thus killing the assassin. The Paladin, not knowing his sister was already dead, fought past the dozens of Avengers before coming to the body of his sister and the assassin... and then bled to death from his wounds.