In every Look Back, we examine a comic book issue from 10/25/50/75 years ago (plus a wild card every month with a fifth week in it). This time around, we head back to September 1973 for the conclusion of the Avengers/Defenders War, the most intricate Marvel crossover ever at the time.
Source：https://www.cbr.com/avengers-defenders-war-conclusion-50th-anniversary/
