At least, should he attempt it, they would have ample warning.

They could provide ample warning of approaching trouble and allow the local militia time to turn out.

This, of course, provided ample warning that a major French attack was coming.

"They're trying to do what's right and give the parents ample warning."

"So they would have had ample warning that someone was coming?"

Please post yourself outside and make sure that anyone who comes in here gives me ample warning.

A lot of parts give us ample warning before they give up the good fight.

"It's ample warning of what will happen if we fail to act."

No one could say he had not given ample warning, in writing, from the very beginning.

Most neighborhoods had one so that residents would have ample warning to flee.