If your unit loses the combat, but does not flee, it can still attempt a combat reform.
In this case, your unit must pass ato muster the necessary discipline to alter its formation. Note that this Leadership test is subject to any modifiers from having lost the fight, just like a Break test. If your unit is steadfast the test is taken on the unit's unmodified Leadership. If the test is failed, your unit cannot make a combat reform. If the test is passed, the combat reform can be carried out as described above.