The mass combat rules from RoW are not that strong. I have run that module about three times, but I have only used the mass combat once. It does have potential, and you will need a hex map, but as I remember things, Last Battle was better.
The largest problem is the lack of focus on the PC's, who quickly get lost in the action and bored as you sit there and fight out multiple large firefights. It could be useful for more organized GM's who could take time prior to the gaming session to work out some of the rolls, and then run the battle as 'scripted' while maintaining some level of random chance.
I found it alot easier as a GM to make some random abstract rolls (such as rolling a single attack die for each unit and doing a simple comparison to determine casualties etc.) while keeping the action on the PC's
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