Unless units fight in hand-to-hand melee combat there is always a spacing of N meters between them. Virtually, there is no way for two friendly units to collide with each other, while enemy units can engage or disenage combat disengage to/from combat only by performing special movement manuevers called maneuvers called Charge and Retreat correspondingly. There is a bug in DO when enemy units may still collide with each other during wheeling.
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