[ssl232]

> Maps cover the spatial side of war, but in addition it's difficult to follow the timeline.

I'd love for there to be an OpenStreetMap style history project with a slider to change the date, allowing users to fill in battle lines and unit positions throughout history. There must be enormous troves of information on units and battles in archives around the world that can be put online in the right form. One obvious problem would be overcoming conflicting accounts of unit positions, strengths and extents, but even basic information on positions of units over time would allow users to get an idea of what was happening in a theater by dragging the slider.

[SimplyUnknown]

Not quite what you are looking but if you're interested in Operation Market Garden: for the Dutch maps there is https://www.topotijdreis.nl, which gives you historical maps with a year slider. This can at least help one visualize how cities, villages, and topography at through the years.

[admaiora]

There's also tools that wrap a part of toporijdreis and add other georeferenced historical maps! I recently saw one of those at https://geodienst.xyz/pastforward. Wish more people georeferenced historical maps, but it is tough.

[jeffreyrogers]

I made something like this and briefly had it online but I didn't think there would be enough demand to make the time and costs of running it worth it.

[habi]

In theory https://www.openhistoricalmap.org/ could do exactly this.