In 1913 Alexander Conze published some of the antiquities found at Pergamon. One of these was a remarkable relief from the second century BCE showing a battle on land. While Greek artists usually portrayed battle as a fight between scattered individuals, this relief shows different types of soldiers crowded together and even a Macedonian phalanx with its battle standard. The University of Heidelberg has generously digitized their copy of Conze’s book as part of the Heidelberger historische Bestände- Digitaler:
Digital collections are fragile and tend to centralization with all its risks, so one very good solution is for large libraries in different countries to digitize and host their own collections while still preserving the originals on paper. The University of Toronto Robarts Library in Canada has also been generous in this way.
Many thoughtful people worry that the Internet has popularized research which has since been refuted; for all its rhetoric of being up-to-date, Wikipedia relies heavily on the 1911 Encyclopaedia Britannica. On the other hand, the Internet has also made volumes which were once available only in a few references libraries available to the scholarly public. As the Pergamon bronze battle scene appears to have been lost, this sketch is as close as one can get to it.
Further Reading: Edition by the Universitätsbibliothek Heidelberg http://digi.ub.uni-heidelberg.de/diglit/pergamon1913/0165