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Our party was helping a group of soldiers defend a fort on a trade route in the middle of nowhere, and we got attacked by a huge army of goblins. (How huge? Everything short of the DM saying 'look, fighting them isn't the right solution'). The nine of us who survived the first attack retreated to the keep, where the soldiers' leader brought out six invisibility potions. There were five of us (Cleric, Bard, Rogue, Swashbuckler and my Monk), three NPC soldiers and their boss. The boss volunteered to stay in the fort, as did one of the other NPCs, so there were seven of us and six potions.
The Cleric and I tried to work out a way to get as many of us out as possible, but since you can't just sneak someone visible out inside your invisible clothes, we had trouble, until I pointed out that A: a dead body counts as an obect B: carried objects become invisible and C: the halfling bard only weighed about 30lb. (to be fair to my character here, he's LN, not good, and it was the best way to get all seven people out that he could think of).
So we strangled the bard, tied some string to her, drank the potions and sneaked out of the fort.
Just after passing through the goblin army, the swashbuckler's potion wore off and the two NPCs we had saved were caught and killed by goblin cavalry, so it didn't end up getting us much. The bard has yet to be raised.