The declarations had not yet come, but on Aug. 28, 1939, Europe already knew war was on its way. On that day, 75 years ago, the armies that would fight what became World War II had gathered.

Just how many soldiers that meant differed by nation, as TIME pointed out to its readers with the map below, which ran in the Sept. 4, 1939 issue. The annotated chart also provides evidence that, no matter how many men were under arms, there was no way for the continent to be entirely ready for what was to follow. In Poland, for example, President Ignacy Moscicki was said to have told Roosevelt that he was willing to negotiate with Germany. By the time Sept. 4 came around — the magazine arrived on stands before then— that willingness had already proved pointless.

On desktop, roll over the map to get a closer look. If you’re reading on a mobile device, click to zoom.



TIME

Stay tuned next week for further coverage of the 75th anniversary of the beginning of World War II.

Write to Lily Rothman at lily.rothman@time.com.