I take a break by switching from tactical to operational level warfare, like The Operational Art of War. back & forth, keeps both fresh. Currently doing 'what if' scenario where instead of sending forces south for the great kiev encirclement in august 1941, germans go for broke toward Moscow, as guderian et al suggested. I am encircling and destroying lots of soviet forces, but dang, there's always more. And my supply lines aren't getting any shorter. Turns out mechanized units need fuel, who knew? And in two years or so I bet I'll be doing 1941 battles like this in CM (please please please).