I'm not sure that military can be strategical anymore, like others said. Back in the day, global wars were much smaller, and even the 'unbalanced' wars were never more than 2:1. This meant that alliances could actually coordinate attacks against the other side. The one that immediately comes to mind for me is GW2 when FAN/TOP took on a much larger legion. (Was it GW2? who cares you get the point)
It's harder to accomplish that today, with so many more alliances being drawn in.