I don't think you can have 2 Hosts with the same name in Tomcat. Also, the appBase for a host is the directory where exploded WARs go in and you are trying to use it as the base of the WAR itself.
Tomcat applications are defined not with the Host configuration element (which most people never change), but rather with Context configuration elements. Although you can add a Context to Tomcat's server.xml file, that's very bad practice - the preferred locations are to use either TOMCAT_HOME/conf/Catalina/localhost with a file whose name is the same as the URL context (for example, forum.xml), or in the WAR's META-INF/context.xml file.
When it comes to destroying a civilization, gas chambers cannot hold a candle to echo chambers.