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[Avatar: The Last Airbender] Why didn't the Fire Nation use Combustion Man to blow up the walls of Ba Sing Se?

Seems like it would be easier to just draft him instead of building that giant drill.
gpt
While he could cause a lot of damage, it would be hard for one man, even one with his abilities, to get through the wall. A dozen Earthbenders could just keep drawing up Earth to reinforce the wall as needed until he was taken out (Iroh nonwithstanding as he is exceptionally powerful)

The drill also had the advantage of being heavily armored, and it stays in place where the wall can't be filled back in.

If the Fire Nation were to use men to take down the wall, they may be better off simply directing soldiers to melt it with combined firebending efforts.