Taken from the campaign series, made public by the US-Army under www.dean.usma.edu The picture is public domain. It shows the battle of Tannenberg in its last phase

• Source: dean.usma.edu archief kopie op de Wayback Machine

From website:

In 1938 the predecessors of what is today The Department of History at the United States Military Academy began developing a series of campaign atlases to aid in teaching cadets a course entitled, "History of the Military Art." Since then, the Department has produced over six atlases and more than one thousand maps, encompassing not only America’s wars but global conflicts as well.

In keeping abreast with today's technology, the Department of History is providing these maps on the internet as part of the department's outreach program. The maps were created by the United States Military Academy’s Department of History and are the digital versions from the atlases printed by the United States Defense Printing Agency. We gratefully acknowledge the accomplishments of the department's former cartographer, Mr. Edward J. Krasnoborski, along with the works of our present cartographer, Mr. Frank Martini.

Please be aware that these maps are large in file size and may require substantial download times.

Deze afbeelding is een werk van een soldaat of werknemer van de U.S. Army, genomen of gemaakt tijdens de uitvoering van diens officiële taken. Als werk van de federale overheid van de Verenigde Staten bevindt deze afbeelding zich in het publiek domein. العربية ∙ বাংলা ∙ català ∙ čeština ∙ Deutsch ∙ English ∙ español ∙ eesti ∙ فارسی ∙ suomi ∙ français ∙ hrvatski ∙ magyar ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ 한국어 ∙ lietuvių ∙ македонски ∙ മലയാളം ∙ မြန်မာဘာသာ ∙ Nederlands ∙ polski ∙ português ∙ русский ∙ sicilianu ∙ српски / srpski ∙ Türkçe ∙ українська ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−