This looks like it might be inspired by this question, but in fact it's been on my to-ask list for months.
In the novel Mockingjay and the film adaptation Mockingjay Part 1, the Capitol and the rebellion led by District 13 engage in various stratagems against each other: "moves and countermoves", in President Snow's immortal words. In what seems to be one of the Capitol's biggest operations, they send a small fleet of bombers to assault District 13 from the air. The bombing goes on for perhaps a day or two, and then the Capitol forces leave again and the people of District 13 are free to venture out.
Why didn't the Capitol engage in a longer assault on District 13?
The most obvious possibility, to my mind, is to besiege the damn place. Get Capitol troops into position all around District 13 and keep them there, keep the population of 13 trapped underground, maybe even jam their communications if possible. This would essentially cut off the hub of operations for the rebellion, and the fighting in the other Districts would then be easy to shut down.
And if for some reason it wasn't possible to deploy ground troops around 13 (though I can't see why it shouldn't be, given the resources that the Capitol clearly have at their disposal), why not simply continue bombing? Not necessarily a continuous bombardment, but send in some hovercraft every few days, irregularly - keep District 13 in a permanent state of red alert, so that they never have a big enough window of opportunity to move their own troops out or allow their population out of the bunkers.
A single attack, no matter how heavy the bombardment, just seems like massive underkill.