Bastogne ...and the Battle of the Ardennes December, 1944 was first released in Strategy & Tactics magazine #20 (December 1969) along with Anzio Beachhead. It was also available in SPI's "white-box" and "Flat Pack" lines.
This was Dunnigan's first (of several) Battle of the Bulge games.
Per Dunnigan:
"Bastogne was an attempt to do the Bulge with max accuracy. The map was a tedious effort to create, working from Belgian government maps from the 1930s. After Bastogne I decided to emphasize playability in my Bulge designs."
(e-mail with Neopeius, 9-9-11)