Displaying posts from definable categories

Hello.
I’m wondering how I can display the contents of posts in a category via a link in the menu on the blog.
I have a menu with buttons for various pages and one button with this code:

<?php wp_list_categories(‘include=6&title_li=’); ?>

All it does is show a list of post titles in category 6 as an archive listing, nothing else. I’d like to list the posts in this category 6 with some of the content, meaning those posts with a ‘more’ tag would show up with the text content above that tag, and any pic in the post above the ‘more’ tag would show up, just like in a normal blog page.
I’m sure there’s an easy way to retreive the post contents when listing a category, I just don’t know how.