Then, at a second signal, he sent the final two off to the left.

At a signal, I moved near and put out my hand, ready for the same treatment.

At a signal from the leaders, two of the others came forward.

I want you to get your team together and be ready to move at my signal.

At a signal from their leader one of the two large groups moved out.

At a signal from someone in another car, they opened fire.

Two of them had already started forward at the judge's signal.

At his signal, the rest of the weapons opened up.

The cause was a failure to stop at a signal.

Almost at a signal, though none was given, the women rose.