Well, you better check out what it takes to get a servlet J2EE app up and running. You cannot just copy everything into some directory in /webapps and expect it to work.
You need a /WEB-INF directory, a web.xml etc.
The Tomcat site should provide some basic info on how to set it up right. Otherwise check the dir structure of the other applications in /webapps
If you feel the least unfamiliar with servlet applications I suggest that you wait a little with involving Acegi as I think it adds some complexity to it, and just get acquanted to Spring and webapp setup.
"Murphy was an optimist"
(The O'Toole commentary on Murphy's Law)