The captain gets on the loud hailer and shouts
"Ahoy, small craft, where are you heading?"
One of the Muslims stands up and shouts,
"We're invading England!"
The crew of the destroyer all start laughing and when the captain finally gains his composure, he gets back on the loud hailer and says
"Just the four of you?"
The Muslim stands up again and shouts,
"No, we're the last four- the rest are already there!"
h/t Kirby