What law did Claudius 2nd pass for the men to go to the army?

He placed a ban on all marriage within Rome. His basic thought process was that men would pay more attention and have more devotion to his army if they did not have the worry of a family back home.

However, this ban did not last long being Claudius was only Emperor for two years before dying of a plague.

This story is also the basis for the story of St. Valentine and why he is celebrated..