Forum:Red Dragon Archfiend and Newdoria

If Red Dragon Archfiend attack a face down Newdoria, and that Newdoria is the only monster that my opponent control. The effect of Newdoria activates or no? I am a little confuse, because in the text of Red Dragon Archifiend says that “destroy all Defense Position monsters your opponent controls after damage calculation” Because the text says "AFTER", I don’t know if Newdoria (only monster that my opponent control) is destroyed by battle ore by the effect of Red Dragon Archfiend. 189.227.10.34 16:59, May 12, 2010 (UTC)