The Dragon of Paris
Cannons were roaring. Enjorlas was having a somewhat difficult time hearing them. This was probably their fault. The national guard was advancing. Again. This looked like the killing blow. Then Grantaire stumbled out of the cafe with a bottle of liquor. Everyone ignored him, because he was useless and going to die anyway. Until he climbed on top of the barricade and said to Enjorlas, just loud enough to be heard
"Do you know why they call me Le Dragon de Paris?"
Enjorlas, understandably distracted, replied
"For Robspierre's sake Grantaire, now isn't the time for a drunken anecdote!"
"It's more of a demonstration, really"
And he leapt over the barricade, taking his liquor with him, took a big swallow, and breathed fire on the front 3 lines of guardsmen. They ran about, desperately trying to put the fire out but only succeeding in lighting several of their compatriots as well. The confused and panicked 4th line got it next, being virtually obliterated along with the 5th and 6th. That was when the National Guard deemed the rebel's kill-death ratio too high to deal with and ran for their goddamn lives. Grantaire climbed back over the barricade, returned to the cafe, and went back to sleep.
To be honest I'm kind of ashamed that my barricade day fic is basically just a big Avatar reference, but hey, they survive, so it counts.