It is an invalid document, the contents were moved to March of the Ents a while back so I stubbed the doc out and put in a #REDIRECT on it as listed on line 1 of this post. (I figured 'just incase' it is used somewhere, just redirect...)
The syntax is correct, I double checked looking at the {{D}} template, which redirects successfully to the {{Delete}} template but it just doesn't seem to work.
Greetings; the issue here appears to be the carriage return after the redirect tags mentioned. Removing those and having just the redirect line as the only line of the wiki text has cleared this up. The March of the Ents and Roll the Drums pages should be redirecting properly now.
So, if you see a redirect not working properly, try stripping out any extra text before or after the redirect code. If that still doesn't fix it, let me know.