What if they launch a full-scale assault on Earth instead?

No need to cause a panic, but this looks like a full-scale assault.

By the time the Sheriff tracks them down, a full-scale assault is under way, and the two men join forces.

That made much more sense than full-scale assaults on hard targets.

It would require a full-scale assault to break out against heavy opposition.

There never was a full-scale assault on the other side.

All agreed that a full-scale assault against the city could not be postponed.

"How do we liberate an entire system without a full-scale assault?"

A bombing was likely, and a full-scale assault was not out of the question.

The people of the city were roused and told to make ready for a full-scale assault.