What happens when multiple units stay on the battlefield because my unit did not kill theirs and my unit took no damage because of Counter Strike?

When your unit survives combat alongside the defender's unit(s) after the damage step, the combat concludes with a "No Result," and your attacking units are recalled to your base.

Here is the breakdown of how this sequence resolves based on the rules and the FAQ:

1. Combat Damage Step

• Counter Strike: Because you played Counter Strike, the next time your chosen unit would be dealt damage, it is prevented. Since combat damage is dealt simultaneously (Rule 460.2.c.1.a), Counter Strike prevents all combat damage that would have been dealt to your unit by all opposing units at that battlefield (RiftJudge FAQ 8527).
• Damage Assignment: Even though your unit takes no damage, the combat damage step still occurs. If the defender's units have Might, they will still assign and deal damage to your units (unless those units were also protected or killed).

2. Combat Cleanup (Resolution Step)

After the damage step, the game checks the state of the battlefield:

• "No Result": According to Rule 461.3.d, there is "No Result" if both players have units present at the battlefield during the resolution step.
• Recall: According to Rule 461.1.a.2 and RiftJudge FAQ 9083, if both players have units remaining at the battlefield after the damage step, the attacking units are recalled to their controller's base.

Summary of Outcome

1. Combat Damage: Your unit takes no damage due to Counter Strike, but the combat proceeds normally.
2. Recall: Because both you and your opponent have surviving units at the battlefield, your attacking units are recalled to your base.
3. Control: The defender retains control of the battlefield because your units have been recalled and theirs remain (RiftJudge FAQ 9083).

This is my interpretation based on the provided rules and FAQs. No official FAQ exists for this specific interaction involving Counter Strike specifically in a "No Result" scenario, but the rules for combat resolution and recall are clear.