I was thinking about the problems of late-game unit management and "carpets of doom" that can make it difficult and time-consuming to move large numbers of units across the map. Perhaps units could be put in a "Column March Mode" that allows them to be moved as a stack? While Column Marching, the stack is still affected by zone of control (even if the units in the stack are immune to it), the stack cannot enter cities, units in the stack cannot attack until they are "deployed" (i.e. moved out of the stack), and the stack itself would be vulnerable to attacks (i.e. ambushes). If an enemy unit attacks the stack, damage would be applied to all units in the stack. This could alleviate some of the tedium of having to move large numbers of units across the map, as well as situations in which large numbers of units have to funnel through a narrow gap between obstacles. On top of that, there could be a command that has to be issued in order to start stacking units, that way, you don't accidentally stack them while clicking and dragging units on the front line (and thus making them vulnerable to attack), and you can still "swap" the positions of units as you do now. What do people think of this idea? Does it seem like it would work?