Great documentary, going over ww2 week by week (still ongoing).
Here's an episode at the start of the Winter War[0]. The whole series is worth a watch though.
[0] https://www.youtube.com/watch?v=GUwCd-j5xL4
Edit: Related, the same people did an entire week by week version of WW1, The Great War (now complete)[1].
[1] https://www.youtube.com/watch?v=6FgaL0xIazk&list=PLB2vhKMBjS...