3ed and 4ed compatibility

[plloyd1010]

3rd and 4th edition rules can be used across the series. There are differences. I can think of 3 that you should keep in mind.

1. Mechanized vehicles are generally a little faster in the 4th edition, but slower on roads than in the 3rd edition. This can make long marches slower, but combat maneuvering more flexible.
   
2. 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.
   
3. Assaults are a fire action in the 4th edition, the 3rd edition had them as a move action. This change means that infantry cannot ride APCs into an assault and participate in the first round. This adds a turn to assault deployments.
   

Most of the other changes do not make as much a difference as those listed. Generally I suggest using the 4th edition rules over the 3rd.