If my opponent stuns a unit from battlefield, do I need to move it back to my base?

Ruling: No, a stunned unit stays on the battlefield. Stun prevents a unit from doing damage in combat.

Sequence:

• Stun prevents the unit from dealing damage during combat
• After the combat damage step, if units from both players are still alive (likely due to the stun), then the attacker is recalled to base

Nuances:

• The unit doesn't automatically return to base just from being stunned
• Return to base only happens if both players' units survive the combat damage step