It's hard to be one of the boys when the boys unite only against a common enemy and at the moment that is oneself.

The first, because you do not believe the Italian Allies could ever find enough in common to unite against a common enemy.

That at least opens up the possibility of uniting against a common enemy.

They were, of course, now united against a common enemy - the global rise in the sea level.

Second is the exciting but all too often disappointing notion that people can unite against a common enemy.

Funny how the usual suspects manage to unite against a common enemy when it suits their purposes.

The tribe has many branches and there are frequent tribal wars, but they have always united against a common enemy.

It is almost impossible to get the tribes to unite, even against a large enemy.

Clearly, a catalyst for change was last month's terrorist attacks, which gave the two countries an opportunity to unite against a common enemy.

Now father and son unite against a common enemy.