Have the defenders of siege battle ever won by fighting inside the city?

Basically, did it ever happen that the assaulting force made it inside a city, and somehow the defenders (without external help) won the battle? I know that usually as soon as the attacker made it inside, it turned into a blood bath for the defenders and the city population, but I wonder if the defenders ever put up so much resistance that the attackers either retreated or were killed inside the city. I'm more interested in pre-Modern times (no Stalingrad). External help that saves a city under siege, like the Turkish Siege of Wien doesn't count.