problem on deployment

[Billy Ng]

I newly installed the tomcat 4.1.12.  I have a war file that works okay with tomcat 
4.0.3.  After I deployed this war file to the tomcat 4.1.12 webapps directory, I got 
the 404 page, why?  Do I need to something different on deployment with 4.1.12?

Thanks!

Billy Ng