It has also found Sudan to be a useful ally in the war on terror.

The confidence of his tone won him a useful ally.

France came to be seen more as an economic competitor than a useful ally.

I was glad to have met her; she might be a useful ally if any language difficulties came along.

He'd make a useful ally at Court, without his mind to get in the way.

This chance meeting had given him opportunity to call in a new and useful ally.

He might even be a useful ally in this mess.

Despite this, he proves to be a very useful ally.

Instead, they were often sought out and valued as useful allies in the various struggles for power.

They were useful allies in other ways, and it would be unfortunate to alienate them.