Gayle, this might answer your question about the Adventists' beliefs regarding "Armageddon"...
Check out this Wikipedia link: http://en.wikipedia.org/wiki/Seventh-day_Adventist_eschatology
Here's the opening paragraphs on that link:
"The Seventh-day Adventist Church holds a unique system of eschatological (or end-times) beliefs. Adventist eschatology, which is based on a historicist interpretation of prophecy, is characterised principally by the premillennial Second Coming of Christ. Traditionally, the church has taught that the Second Coming will be preceded by a global crisis with the Sabbath as a central issue. At Jesus' return, the righteous will be taken to heaven for one thousand years. After the millennium the unsaved will be punished by annihilation while the saved will live on a recreated Earth for eternity.
The foremost sources are the biblical books of Daniel and Revelation. Jesus' statements in Matthew 24 for instance, as well as many other Bible verses are also used. The classic Adventist commentary on the end-times was Uriah Smith's Daniel and the Revelation. The writings of Ellen G. White have also been highly influential, particularly the last part of her book The Great Controversy. "Prophecy seminars", developed since the mid-20th century, have been a key popular source. ..."
In skimming the rest of the article, it does sound as if the 7th-Day Adventists have similar beliefs to the Jehovah's Witnesses - regarding "Armageddon", at least.....
One must wonder at the huge differences in the way the two groups have reacted to such beliefs, though...