Or, looking to Tolkien....Skirmishes are far more likely to happen than full scale battles anyway. That being said, guerrilla warfare can be just as horrific, and given it's in a more intimate setting (focused on far fewer people), can be just as powerful as a huge battle with hundreds or thousands of people dying.
Just look at Vietnam for instance. Or Afghanistan.
The Fellowship's battle in Moria compared to the Battle of Pelennor Fields. Both are wonderful to read but I find Moria far more compelling because I know those involved.