3ed and 4ed compatibility

[joe_oppenheimer]

In general you should be able to play any older modules with the 4th edition rules. I was pretty wedded to 3rd ed, but eventually transitioned and have been happy with the changes.

Hills were limiting terrain in the 3rd edition, but not in the 4th. Scenarios which used hills to cover an approach will be quite unbalanced now.

I find this can be an issue in the older North Africa games (Afrika Korps and Desert Rats) since many scenarios have the defender on a hill that was considered limiting terrain when they were designed. For some of these I've added a house rule to treat the hill as having rocky terrain on it.