Listing posts according to tags

I have one category for news articles, but different articles are sorted by special tags. How do I create separate listings of posts based upon their special tags?
This did not work for me:

<ul>
 <?php
 global $post;
 $myposts = get_posts('numberposts=5&offset=1&tag=thiskindof_news');
 foreach($myposts as $post) :
 ?>
    <li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
 <?php endforeach; ?>
 </ul>