Modern cruise ships in a world-war convoy system

Would modern cruise ships sent into a world war sail independently or in convoy?

Most would sail in convoy because they are too slow to operate safely alone; Queen Mary 2 might be an exception.

The answer draws the traditional distinction between fast liners able to outrun threats and slower passenger ships that depend on escorts. Most modern cruise ships fall into the second category because their service does not demand liner-like speed. In a world-war environment, convoy protection would therefore replace independent routing for most of them. Queen Mary 2 is offered as a possible exception because her ocean-liner design gives her a stronger claim to operating alone.