Asked Bootie a little while ago to set up a forum as part of the CM Scenario Design section for people to post good sources and/or post research questions.
It really depends on what you are after and which units you want to create something from. What engagement are you thinking about undertaking?
A few tips (from an ex Graduate in History if that counts for anything
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- Google is your friend but always try to get two different web sources confirming the same thing or ensure the web material you are using is from a reputable source/has references listed. It's the web, people have a tendency to make stuff up.
- Don't forget to search under 'Google Books' and 'Google Scholar' for journal articles and freeware materials.
- A map is worth 1000 words. A map from 1940's Europe is worth 10,000. Google maps is great but in many cases, especially around urban areas the terrain is completely different to the 1943-44 battlefield.
- Try to match historical photos to an area on the map - helps with getting the 'feel right.'
- Undertake Unit History research and don't forget to research the lead up to engagement you are designing in the editor. The lead up not only tells the narrative about why the battle was fought but also gives you a good indication of troop and equipment quality.
- Have a defined start point of a scenario. What I mean by this is cut off all historical events completely at a certain point - which in game is when the player hits the big red button to get the fight underway. Try to match history to an extent but don't try to 100% replicate the flow of the battle as the player will undoubtedly do something different anyway. (And you'll just go nuts).
Let us know that the scenario is about and I'll see if I know any sources.